Image Credits

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The following table includes the original long urls to the images used.

Image caption	Attribution phrase	Source/link
Figure I.1 Yawning	Yawning little girl by truthseeker08 / Pixabay	pixabay.com/photos/yawning-little-girl-yawn-child-1895561/
Figure I.2 Dreams	Dreams by Rogier Hoekstra / Pixabay	pixabay.com/photos/dreams-fantasy-art-surreal-2904682/
Figure I.3 105-year-old woman	This woman is 105 years old by Joe Green / CC BY-ND 2.0	https://www.flickr.com/photos/82552101@N00/3133747764
Figure I.4 Some of the effects of sleep deprivation	Effects of sleep deprivation by Mikael Häggström «Medical gallery of Mikael Häggström 2014» / CC0 1.0	https://commons.wikimedia.org/wiki/File:Effects_of_sleep_deprivation.svg
Figure I.5 Sleeping on it	Sleeping on it by Sheryl Shook / CC0 1.0	drive.google.com/file/d/1dAUcc5EekSgRlrz9dizd6HggVZGGm981/view?usp=sharing
Figure I.6 Yawning is not just for humans	Yawn . . . by Tancread / CC BY-NC 2.0	https://www.flickr.com/photos/69446921@N00/83525962
Figure 1.1 Nap	Nap by Bery1_snw / CC0 1.0	www.flickr.com/photos/beryl_...otolist-oGd7yb drive.google.com/file/d/1jP4qUdYAP-lumBIHo-xD0zD7j4I4FebY/view?usp=sharing
Figure 1.2 Kalahari ǂKhomani San Bushman	Arri Raats, Kalahari Khomani San Bushman, Boesmansrus camp, Northern Cape, South Africa by South African Tourism from South Africa / CC BY 2.0	https://upload.wikimedia.org/Wikipedia/commons/a/a4/Arri_Raats%2C_Kalahari_Khomani_San_Bushman%2C_Boesmansrus_camp%2C_Northern_Cape%2C_South_Africa_%2819919544304%29.jpg
Figure 1.3 Siesta	Woman Lying Down by Hy Aan / Pexels	www.pexels.com/photo/woman-lying-down-1768968/
Figure 1.4 Napping boosts learning	Man Napping on Books by Oladimeji Ajegbile / Pexels	www.pexels.com/photo/man-napping-on-books-3564013/
Figure 1.5 Skip the side effects and choose to nap	Medication Pills Isolated on Yellow Background by Anna Shvets / Pexels	www.pexels.com/photo/medication-pills-isolated-on-yellow-background-3683098/
Figure 1.6 Power naps for power athletes	Womens Wheelchair Basketball by Audi Nissen / Unsplash	https://unsplash.com/photos/u1CAj5HJzO4
Figure 1.7 Cozy amber lighting	Lighting Ceiling Lights by WaltiGoehner / Pixabay	pixabay.com/da/photos/lys-belysning-loftlamper-orange-459236/
Figure 1.8 Looking cool while blocking blue light	Man Wearing White Crew-neck shirt by Pedram Normohamadian / Unsplash	https://unsplash.com/photos/QchkCq3w_UE
Figure 1.9 Elevate your legs	Person Sitting on Couch While Using Laptop Computer by Pixabay / Pexels	www.pexels.com/photo/apartment-comfortable-contemporary-couch-269129/
Figure 1.10 Midsection view of the male reproductive system	Male Reproductive System by Openstax / CC BY 4.0	https://openstax.org/books/anatomy-and-physiology/pages/27-1-anatomy-and-physiology-of-the-male-reproductive-system
Figure 1.11 Think about your sleep before reaching for an energy drink	man getting can in beverage cooler by NeONBRAND / Unsplash	https://unsplash.com/photos/OGlhEkaMot0
Figure 1.12 Bedtime story	Bedtime Story 2 by Michael Gabelmann / CC BY-NC 2.0	https://www.flickr.com/photos/97411961@N00/26397372635
Figure 1.13 Healthy snack for healthy sleep	Maple Granola by QuintanaRoo / CC BY-NC-SA 2.0	www.flickr.com/photos/84143785@N00/3470512747
Figure 1.14 Pele emerging from lava	Hawaii Volcanoes National Park by Jasperdo / CC BY-NC-ND 2.0	https://www.flickr.com/photos/66733752@N00/6059308503
Figure 1.15 Put a pillow between your legs	Put a pillow between your legs by wikiHow / CC BY-NC-SA 3.0	https://www.wikihow.com/Improve-Your-Sleeping-Position#/Image:Improve-Your-Sleeping-Position-Step-1.jpg
Figure 1.16 Sleeping together	sleeping together by Frerieke / CC BY-NC 2.0	https://www.flickr.com/photos/frerieke/6268206497/in/album-72157627892036730/
Figure 2.1 Central and peripheral nervous systems	The Central and Peripheral Nervous Systems by Openstax / CC BY 4.0	https://cnx.org/contents/FPtK1zmh@15.5:yEs2p8R_@10/12-1-Basic-Structure-and-Function-of-the-Nervous-System
Figure 2.2 Neuron and synapse	Neuron and Synapse by Openstax / CC BY 4.0	https://cnx.org/contents/FPtK1zmh@16.1:mYoZvS9p@9/12-2-Nervous-Tissue
Figure 2.3 The brain	Brain Illustrations by Denise Wawrzyniak / CC BY-NC 4.0	https://ccsearch.creativecommons.org/photos/51f88f19-c521-4af4-bdb0-642dfbd6a161
Figure 2.4 The brainstem	The Brain Structures That Wake You Up and Put You to Sleep by Bruno Dubuc / copyleft	https://thebrain.mcgill.ca/flash/d/d_11/d_11_cr/d_11_cr_cyc/d_11_cr_cyc.html
Figure 2.5 The diencephalon shown in a midsection view of the brain	The Diencephalon by Openstax / CC BY 4.0	https://openstax.org/books/anatomy-and-physiology/pages/13-2-the-central-nervous-system
Figure 2.7 Nuclei of the hypothalamus	Hypothalamus drawing by KCC Library / CC0 1.0	drive.google.com/file/d/1NKF1ktDfKHQVHTbt0JxnytEZEc2wpib3/view?usp=sharing
Figure 2.6 Ipo	Love is on the way by Micah Camara / CC BY-NC-ND 2.0	https://flic.kr/p/dEycCQ
Figure 2.8 Lobes of the human brain	Brain lobes by BruceBlaus, Blausen.com staff (2014) / CC BY 3.0	https://en.wikiversity.org/wiki/WikiJournal_of_Medicine/Medical_gallery_of_Blausen_Medical_2014#/media/File:Blausen_0111_BrainLobes.png
Figure 2.9 The insula	Insula Structure by Schappelle / CC BY-SA 4.0	https://en.Wikipedia.org/wiki/File:Insula_structure.png
Figure 2.10 The limbic system	Limbic system by BruceBlaus, Blausen.com staff (2014) / CC BY 3.0	https://en.wikiversity.org/wiki/WikiJournal_of_Medicine/Medical_gallery_of_Blausen_Medical_2014#/media/File:Blausen_0614_LimbicSystem.png
Figure 2.11 Polysomnogram	Polysomnography Tester by 邱鈺鋒—自己的作品 / CC BY-SA 4.0	https://commons.wikimedia.org/wiki/File:Polysomnography_tester.jpg
Figure 2.12 Baby connected to EEG	EEG Baby by Tess Dixon / CC BY-NC-ND 2.0	https://flic.kr/p/nrWgpL
Figure 2.13 Wave amplitude and frequency as well as a K-complex and sleep spindle	Wave amplitude and frequency by NeoCadre and Knott / CC BY-SA 3.0	drive.google.com/file/d/1sBTrpMGrvpecJVtF1PcoRKNMLBCVjsKU/view?usp=sharing
Figure 2.14 Waves in Hawaiʻi	hawaii by Konstantin Maximov / CC BY 2.0	https://www.flickr.com/photos/29548659@N05/9680029147/in/album-72157635393461433/
Figure 2.15 Riding the perfect wave	man in black shorts surfing on sea waves during daytime photo by Barbara Rezende / Unsplash	https://unsplash.com/photos/dHKXktPp36A
Figure 2.16 EEG recordings	Brainwaves by MIT Open Courseware / CC BY-NC-SA 4.0	https://www.google.com/url?q=https://ocw.mit.edu/courses/aeronautics-and-astronautics/16-400-human-factors-engineering-fall-2011/lecture-notes/MIT16_400F11_lec19.pdf&sa=D&ust=1610682088487000&usg=AOvVaw27mKyOF4fmoTni363TNrM-
Figure 2.17 Polysomnography setup and data	The Meaning of Sleep Quality: A Survey of Available Technologies - by Unknown / CC BY 4.0	www.researchgate.net/Figure/A-graphical-representation-of-the-polysomnography-technology-from-the-user-point-of-view_fig3_337243463 [accessed February 23, 2021]
Figure 2.18 The eye	Physics of the Eye by Openstax / CC BY 4.0	https://openstax.org/books/college-physics/pages/preface
Figure 2.19 EEG, EOG, and EMG	Typical polygraphic recordings by Unknown / CC BY 2.0	www.researchgate.net/Figure/Typical-polygraphic-recordings-during-the-wake-WK-stage-1-S1-stage-2-S2-light_fig1_230712986
Figure 2.20 NREM 2 EEG	Stage 2 sleep by Neocadre / CC0 1.0	https://commons.wikimedia.org/wiki/File:Stage2sleep_new.svg
Figure 2.21 Hypnogram of sleep between midnight and 6:30 a.m.	Hypnogram of sleep between midnight and 6.30 am by RazerM / CC BY-SA 3.0	https://en.Wikipedia.org/wiki/Rapid_eye_movement_sleep#/media/File:Sleep_Hypnogram.svg
Figure 2.22 Actigraphy device and data from a college student	Actigraphy by Unknown / CC BY-NC 4.0	koreascience.or.kr/article/JAKO201535151793878.pdf
Figure 3.1 Nodding off	Man in long black sleeve shirt sitting by RODNAE Productions / Pexels	www.pexels.com/photo/man-in-black-long-sleeve-shirt-sitting-7581035/
Figure 3.2 Circadian rhythm	Biological Clock Human by YassineMrabet / CC BY-SA 3.0	https://commons.wikimedia.org/wiki/File:Biological_clock_human.svg
Figure 3.3 ATP chemical structure	ATP chemical structure by cacycle / CC BY-SA 3.0	https://commons.wikimedia.org/wiki/File:ATP_chemical_structure.png
Figure 3.4 Circadian rhythm versus sleep pressure	Circadian rhythm vs. sleep pressure by Hikialani Guzman / CC BY 4.0	drive.google.com/file/d/175eCOopRwpXdZCvXjzXlFSaWRrK5RZ0N/view
Figure 3.5 The cave behind Waiānuenue Falls	Waianuenue by Thomas / CC BY-ND 2.0	https://flic.kr/p/MexbBD
Figure 3.6 Circadian rhythm of physiological measures	Circadian Rhythm (p. 16) by MIT Open Courseware / CC BY-NC-SA 4.0	https://www.google.com/url?q=https://ocw.mit.edu/courses/aeronautics-and-astronautics/16-400-human-factors-engineering-fall-2011/lecture-notes/MIT16_400F11_lec19.pdf&sa=D&ust=1609878274190000&usg=AOvVaw1jz_e1wv9eSleQE2xyr09P
Figure 3.7 How many zeitgebers do you see in this photo?	Smiling coworkers in aprons using laptop together by Ketut Subiyanto / Pexels	www.pexels.com/photo/smiling-coworkers-in-aprons-using-laptop-together-4353605/
Figure 3.8 Neuroanatomy of the circadian system	Neuroanatomy of the circadian system (p. 6) by MIT Open Courseware / CC BY-NC-SA 4.0	https://ocw.mit.edu/courses/architecture/4-430-daylighting-spring-2012/lecture-notes/MIT4_430S12_lec11.pdf
Figure 3.9 Light and dark impact the pineal gland’s release of melatonin	Light, Suprachiasmatic nuclei (SCN), and the pinealmelatonin circuit by Ma Z, Yang Y, Fan C, et al. / CC BY 4.0	https://commons.wikimedia.org/wiki/File:Light,_suprachiasmatic_nuclei_(SCN),_and_the_pinealmelatonin_circuit.jpg
Figure 3.10 During the winter, the sun does not rise at all in Tromsø, Norway.	Tromso Polar Night by Mariusz Kluzniak / CC BY-NC-ND 2.0	https://flic.kr/p/9bQErF
Figure 3.11 Bright lighting in the classroom	Shallow Focus Photography of Girl by Akela / Pexels	www.pexels.com/photo/blur-children-class-classroom-448877/
Figure 3.12 Lark and owl	Collage by Jason Ford using Crested Lark by Koshy Koshy / CC BY 2.0, and Owl by Eduardo Skinner / CC BY-NC 2.0.	drive.google.com/file/d/1dXnKm-BCFZcx9pPNuikGLA1uNlBf3fPn/view?usp=sharing
Figure 3.13 Storytelling	Storytelling by Renu Parkhi / CC BY-NC-ND 2.0	https://flic.kr/p/Yu15z
Figure 3.14 Shift workers	SR 520 Pavement Repair by WSDOT / CC BY-NC-ND 2.0	https://www.flickr.com/photos/7821771@N05/3379585174
Figure 3.15 Flying into a different time zone	N587HA Hawaiian Airlines Boeing 767–33A/ER (cn 33421/887) «Pakalakala»—McCarran International Airport by Tomas Del Coro / CC BY-SA 2.0	https://flic.kr/p/2heXfZf
Figure 3.16 Caffeine impacts the circadian rhythm.	Coffee at Cafe Reno by Cafe Reno / CC BY 2.0	https://flic.kr/p/dbuexQ
Figure 3.17 Sleeping in space	Sleeping in Space by NASA / PD	https://www.nasa.gov/image-feature/sleeping-in-space
Figure 3.18 Sometimes polyphasic sleeping is referred to as the uberman schedule. This Figure compares polyphasic to biphasic sleep. The circle represents time in the twenty-four-hour day, so the small dark blue sectors in the uberman (polyphasic) schedule are the six thirty-minute naps. On the biphasic image, the large dark blue sector is eight hours of nighttime sleep and the small sector is the twenty-minute afternoon nap.	Collage by Jason Ford using Uberman Polyphasic Sleep Pie Chart and Biphasic Sleep Pie Chart by Master Uegly / CC0 1.0	drive.google.com/file/d/1QfIn-0L1Ai2KTIidDrjOQGu2Py-n6nO0/view?usp=sharing
Figure 4.1 Delicious	Delicious by Chris Phutully / CC BY 2.0	https://www.flickr.com/photos/72562013@N06/8348522161/in/photolist-dHJmMg
Figure 4.2 Red ant	Red ant closeup by John Pupkin / CC0 1.0	https://pixy.org/194468/
Figure 4.3 Shark	Sleepy shark by Harry Metcalfe / CC BY 2.0	https://www.flickr.com/photos/harrymetcalfe/5406228674/in/album-72157625949793722/
Figure 4.4 Australian dragon	Mature Eastern Water Dragon. Intellagama lesueurii by gailhampshire / CC BY 2.0	https://www.flickr.com/photos/gails_pictures/15406633089/in/photostream/
Figure 4.5 Honu	honu by eggrole / CC BY 2.0	https://www.flickr.com/photos/35387910@N04/3407763336
Figure 4.6 Safe sleeping with sentinels	Pretty Ducks All in a Row by Peter Radunzel / CC BY-NC 2.0	https://flic.kr/p/9wyCTe
Figure 4.7 Frigate bird	Magnificent Frigatebird (Female) 10—Blackbird Caye—Belize 2016 by Adam / CC BY 2.0	https://www.flickr.com/photos/concertsandcomedy/24764852212/in/album-72157664362602996/
Figure 4.8 Dolphins	Dolphins by ryn413 / CC BY 2.0	https://www.flickr.com/photos/42596236@N07/3952952164
Figure 4.9 Bat	Flying Dog Aethalops Mammal Fledertier Chiroptera by Hans / Pixabay	pixabay.com/photos/flying-dog-aethalops-mammal-4136563/
Figure 4.10 Sea otters	Romp of Otters. Sea Otter Mom with NOT Two Pups but ONE sea-otter-mom-and-pup-4-16-07_2 by Mike Baird / CC BY 2.0	https://www.flickr.com/photos/mikebaird/462500055/sizes/h/
Figure 4.11 Sleeping sperm whales	Sperm Whale Sleeping by Stephane Granzotto / All rights reserved	https://www.nationalgeographic.com/photography/proof/2017/07/sperm-whales-nap-sleeping-photography-spd/
Figure 4.12 Hawaiian monk seal	Hawaiian Monk Seal by dazegg / CC BY-NC-ND 2.0	https://flic.kr/p/8REb2L
Figure 4.13 Monotreme, placental, and marsupial mammals	Collage by Jason Ford / CC BY-SA 2.0 using Wild Platypus 3 by Klaus / CC BY-SA 2.0; Melbourne Zoo, Australia by Tom Thanachart / CC BY-SA 2.0; and Pregnant Woman by Graham Crumb / CC BY-SA 2.0	drive.google.com/file/d/1sj1OZ9BGaXDP_7tWpW6NtEpbmju6h1FI/view?usp=sharing
Figure 4.14 Ground squirrel	Belding’s Ground Squirrel by Ben Amstutz / CC BY-NC 2.0	https://flic.kr/p/PyCom
Figure 4.15 Bear	Sleeping bear by Morpheus_uk / CC BY-NC 2.0	https://www.flickr.com/photos/morpheus_uk/363236339/
Figure 5.1 Under the covers	Unrecognizable person sleeping under blanket by Ketut Subiyanto / Pexels	www.pexels.com/photo/unrecognizable-person-sleeping-under-blanket-4546117/
Figure 5.2 We’ve all been there.	The Socially Awkward Adult by Neethi Goldhawk / CC BY-NC-ND 4.0	www.behance.net/gallery/54341681/The-Socially-Awkward-Adult/modules/320531069
Figure 5.3 Staying together	Two Women Looking Up by Riya Kumari / Pexels	www.pexels.com/photo/two-women-looking-up-1404920/?utm_content=attributionCopyText&utm_medium=referral&utm_source=pexels
Figure 5.4 Soldier	Soldier by Alf-Marty / Pixabay	pixabay.com/illustrations/soldier-2335939/
Figure 5.5 Transforming the nightmare	Woman Hai Great White Shark by SarahRichterArt / Pixabay	pixabay.com/photos/woman-hai-great-white-shark-2435605/
Figure 5.6a Virtual reality goggles	Virtual Reality Goggles by Alvin Trusty / CC BY-NC 2.0	https://flic.kr/p/R6c8qU
Figure 5.6b Maze	Maze by Aaron Webb / CC BY-NC-SA 2.0	https://www.flickr.com/photos/68009656@N00/15006172613
Figure 5.7 Frankenstein	Frankenstein by Special Collections at John Hopkins University / CC BY-NC-ND 2.0	https://flic.kr/p/azeNWF
Figure 5.8 Madam C. J. Walker	Madam C.J. Walker by Scurlock Studio / CC0 1.0	https://simple.Wikipedia.org/wiki/Madam_C._J._Walker#/media/File:Madame_CJ_Walker.gif
Figure 5.9 Facial expressions	Sheryl Shook Collection by Sheryl Shook / CC0 1.0	drive.google.com/file/d/1yZoKPJnl8UjULx4PEJTkNXloMD1wDcVm/view
Figure 5.10 The pons is highlighted in red.	Collage by Jason Ford using Pons by Was a bee / CC BY-SA 2.1 JP and Happy-Cat by Miss Nixie / CC BY-NC-ND 2.0	drive.google.com/file/d/18XZUi5FBrRoFbt9ThoFTGNjfB27ueDrF/view?usp=sharing
Figure 5.11 In the MRI	In the MRI by chezsterno / CC BY-NC-SA 2.0	https://www.flickr.com/photos/chezsterno/158369167/in/photolist-eZFCT
Figure 5.12 Ventromedial prefrontal cortex	Ventromedial prefrontal cortex by Finereach~commonswiki / CC BY 3.0	https://commons.wikimedia.org/wiki/File:Ventromedial_prefrontal_cortex.png
Figure 5.13 Motor and sensory regions of the cerebral cortex	Motor and Sensory Regions of the Cerebral Cortex by BruceBlaus / CC BY 3.0	https://commons.wikimedia.org/wiki/File:Blausen_0102_Brain_Motor%26Sensory.png
Figure 5.14 Mesopotamia	Map of Mesopotamia by Goran tek-en / CC BY-SA 4.0	https://commons.wikimedia.org/wiki/File:N-Mesopotamia_and_Syria_english.svg
Figure 5.15 Green sea turtle	Green Sea Turtle by Brocken Ingalory / CC BY 3.0	en.m.Wikipedia.org/wiki/Green_sea_turtle#/media/File%3AGreen_turtle_swimming_over_coral_reefs_in_Kona.jpg
Figure 5.16 Temple of Isis	Temple of Isis, Philae by Zolakoma / CC BY 2.0	https://www.flickr.com/photos/15164743@N05/2774331481
Figure 5.17 The wave	The Wave by Marcel Lamieux / CC BY-NC 2.0	https://flic.kr/p/6W6Cqv
Figure 5.18 Stretching together before the discussion	Ladies stretch circle by piqsels.com / CC0 1.0	https://www.piqsels.com/en/public-domain-photo-zknfq
Figure 6.1 Mouth and pharynx	Mouth and pharynx by BruceBlaus / CC BY 3.0	commons.wikimedia.org/wiki/File:Mouth_and_pharynx.png
Video 7.3.2 What causes snoring and obstructive sleep apnea?	What Causes Snoring and Obstructive Sleep Apnea? by Capital Otolaryngology Head and Neck Surgeons / All rights reserved	https://youtu.be/inmop4Kv8PI
Figure 6.2 Continuous positive airway pressure (CPAP) consists of a piece that goes over the mouth and/or nose.	Using a CPAP by Soozie Bea / CC BY-SA 2.0	https://flic.kr/p/SpAHe7
Figure 6.3 Hā	Breath Drawing 2 by Malia Hasegawa / CC BY 4.0	drive.google.com/file/d/1WuAXMvsX1bahEhfWDsd40gdTfg3SWxnA/view
Figure 6.4 Back to sleep	Baby in Grey Onesie Lying in Bed by Reynardo Etenia Wongso / Unsplash	https://unsplash.com/photos/jY61RtmjCdY
Figure 6.5 Stretching	Yoga by Jaime Fok / CC BY-NC-ND 2.0	https://flic.kr/p/fsK56b
Figure 6.6 Sleep paralysis hallucination	The Nightmare by John Henry Fuseli / CC0 1.0	commons.wikimedia.org/wiki/Johann_Heinrich_F%C3%BCssli#/media/File:John_Henry_Fuseli_-_The_Nightmare.JPG
Figure 6.7 Falling asleep	Falling to Sleep by Shena Tschofen / CC BY-NC-ND 2.0	https://flic.kr/p/hdLRV9
Figure 6.8 Midnight snack	Boy in white and black tank top by Chander Mohan / Unsplash	https://unsplash.com/photos/eYzg_aaTkcU
Figure 6.9 Sleepwalking can be dangerous.	A Photography Of A Man Standing On A Tree by Lukas Rodrigues / Pexels	www.pexels.com/photo/a-photography-of-a-man-standing-on-a-tree-3680219/
Figure 6.10 Nightmares	Spook by Mysticsartdesign / Pixabay	pixabay.com/photos/ghosts-gespenter-spooky-horror-572038/
Figure 6.11 Can’t sleep	cant sleep by you me / CC BY 2.0	https://flic.kr/p/dksYr5
Figure 6.12a Owl	Owl Animal Bird by OpenClipart-Vectors / Pixabay	pixabay.com/vectors/owl-animal-bird-flowers-funny-158408/
Figure 6.12b Lark	Meadowlark Bird Lark by Clker-free-vector-images / Pixabay	pixabay.com/vectors/meadowlark-bird-lark-wings-stump-46453/
Figure 7.1 Sleepy driving causes as many deaths as drunk driving.	Car keys with glass of whiskey on table by Fort George G. Meade / CC BY 2.0	https://www.flickr.com/photos/64000826@N08/49173258126
Figure 7.2 Sleep debt by country	Sleep Debt Graph by Jason Ford / CC0 1.0	drive.google.com/file/d/1tZ9PZMNo1gg2sP88qNczFjc9ba3E2Jn3/view?usp=sharing
Figure 7.3 US Capitol	Capitol by Pierre-Selim / CC BY-SA 2.0	https://flic.kr/p/cvDgNJ
Figure 7.4 One race: The human race	photomontage by geralt / Pixabay	pixabay.com/illustrations/photomontage-faces-photo-album-577022/
Figure 7.5 Kapu Aloha. Find your cause and speak out!	Kapu Aloha by H. Doug Matsuokoa / CC BY 2.0	https://flic.kr/p/uSKdaS
Figure 7.6 Hawai‘i standing with Standing Rock #NoDAPL	Hawaii Standing With Standing Rock #NoDAPL! by 340.org / CC BY-NC-SA 2.0	https://flic.kr/p/MeKKbv
Figure 7.7 Nap pod	Google nap pod by Crystal Calderon / CC BY-NC-ND 2.0	https://flic.kr/p/4SENv5
Figure 7.8 Sleeping in class	sleepin in class by Jake / CC BY-SA 2.0	https://flic.kr/p/E8Mz7
Figure 7.9 Golden Gate Bridge, San Francisco, California	Golden Gate Bridge during daytime by Maarten van den Heuvel / Unsplash	https://unsplash.com/photos/gZXx8lKAb7Y
Figure 7.10 Zombies	Action by Tan Cundrawan / Pixabay	pixabay.com/illustrations/action-active-activity-actor-2483679/
Figure 7.11 Wana (sea urchin) are a source of healing food in Hawai‘i.	Wana Education by NPS Photo / CC0 1.0	https://www.nps.gov/articles/000/hoonau-mooolelo.htm
Figure 7.12 Physicians have the potential to play a critical role in sleep wellness.	Infermeiro—Saúde by Francisco Venâncio / Unsplash	https://unsplash.com/photos/M4Xloxsg0Gw
Figure 7.13 MedGlobal volunteer performs surgery at Al-Shifa hospital in Gaza Strip	MedGlobal Volunteer Performs Surgery at Al-Shifa Hospital in the Gaza Strip by MedGlobal / CC BY-NC-ND 2.0	https://www.flickr.com/photos/182915307@N07/48649138206
Figure 7.14 Start a sleep wellness conversation at the barbershop.	Men’s Gray Crew Neck Shirt by Thgusstavo Santana / Pexels	www.pexels.com/photo/men-s-gray-crew-neck-shirt-1804638/
Cover photo: Poppies, lupine, and bluebells create carpets of color in California during the spring.	Poppies, lupine, and bluebells create carpets of color in California during the spring by Jack Prichett / Unsplash	https://unsplash.com/photos/cmKQWcKWKxE

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