Sleep is important, but not all animals need the same kind of deep rest as humans. From sleeping standing up to sleeping inside snot bubbles, here are 8 especially strange ways some animals catch their ZZZs.
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Sources:
Sleeping Standing Up:
http://www.equisearch.com/article/eqzzz629-11363
http://www.washingtonpost.com/wp-dyn/content/article/2008/07/13/AR2008071301635.html
http://news.nationalgeographic.com/2015/07/150711-animals-science-sleep-horses-bison-moose/
Sleeping Very Little:
https://www.academia.edu/18703785/Behavioural_sleep_in_the_giraffe_Giraffa_camelopardalis_in_a_zoological_garden?auto=download
http://animaldiversity.org/site/accounts/information/Giraffa_camelopardalis.html
http://animals.sandiegozoo.org/animals/giraffe
Sleeping in Flight:
http://jeb.biologists.org/content/205/7/905
http://www.smithsonianmag.com/science-nature/this-bird-can-stay-in-flight-for-six-months-straight-903069/?no-ist
http://www.nature.com/ncomms/2013/131008/ncomms3554/full/ncomms3554.html
http://www.nature.com/ncomms/2016/160803/ncomms12468/full/ncomms12468.html
https://www.theguardian.com/science/neurophilosophy/2016/aug/05/frigatebirds-sleep-in-mid-flight
Uni-hemispheric Sleep:
http://www.scientificamerican.com/article/how-do-whales-and-dolphin/
http://us.whales.org/faqs/facts-about-whales-and-dolphins/how-do-dolphins-sleep
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0047478
http://www.sciencedirect.com/science/article/pii/S0149763408000912
http://www.sciencemag.org/news/1999/02/half-brained-ducks-row
Drift Diving:
http://io9.gizmodo.com/5932354/this-is-how-sperm-whales-sleep-yes-really
http://www.cell.com/current-biology/fulltext/S0960-9822(07)02200-2
http://scienceline.ucsb.edu/getkey.php?key=1009
http://us.whales.org/faqs/facts-about-whales-and-dolphins/how-do-dolphins-breathe
Yo-Yo Diving
https://www.flmnh.ufl.edu/fish/discover/sharks/basics/
http://www.huffingtonpost.com/van-winkles/how-do-sharks-sleep-do-th_b_7743920.html
http://marinelife.about.com/od/fish/f/howdosharkssleep.htm
Sleeping Inside Snot Bubbles
http://news.bbc.co.uk/earth/hi/earth_news/newsid_9196000/9196440.stm
http://rsbl.royalsocietypublishing.org/content/7/2/292
Invertebrate REM Sleep
https://www.researchgate.net/publication/229150667_Behavioral_sleep_in_Octopus_vulgaris
http://www.thetimes.co.uk/tto/environment/wildlife/article4015214.ece
http://discovermagazine.com/2003/oct/feateye#.UTFwbiaxb-Y
IMAGES:
https://en.wikipedia.org/wiki/File:Male_Frigate_bird.jpg
https://commons.wikimedia.org/wiki/File%3AFrigateBird.jpg
https://commons.wikimedia.org/wiki/File%3AMallard-snow-kingston-ontario-march-2008.JPG
https://commons.wikimedia.org/wiki/File%3AShark_ear.jpg
https://commons.wikimedia.org/wiki/File:Blueshark_300.jpg#/media/File:Blueshark_300.jpg
https://commons.wikimedia.org/wiki/File%3AScarus_trispinosus_dormindo.tif
https://commons.wikimedia.org/wiki/File%3AScarus_zelindae.jpg
https://commons.wikimedia.org/wiki/File%3ABluestreakCleanerWrasse.jpg
https://commons.wikimedia.org/wiki/File%3AGnathiid_isopod.jpg
