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In this video:
Everyone needs sleep, but for many birds, by necessity this has to happen while perched on a branch or other place that must be gripped. Anyone who has ever fallen asleep reading and found her book on the floor knows how difficult it can be to hold onto something while snoozing. So how do perching birds do it?
Want the text version?: http://www.todayifoundout.com/index.php/2014/10/birds-grip-things-sleep/
Sources:
http://health.clevelandclinic.org/2014/05/22-facts-about-sleep-that-will-surprise-you-infographic/+http://sleepfoundation.org/sleep-news/25-random-facts-about-sleep+http://www.abc.net.au/science/sleep/facts.htm
http://arsanatomica.tumblr.com/post/20331557664
http://www.fernbank.edu/Birding/bird_feet.htm
http://www.uchospitals.edu/news/1998/19981217-bird.html
http://www.independent.co.uk/news/birds-sleep-with-half-brain-off-and-rest-on-1068533.html
http://www.cnn.com/TECH/science/9902/03/birds.eye/
http://www.ncbi.nlm.nih.gov/pubmed/22539208
http://www.abc.net.au/science/articles/2014/02/18/3944327.htm
http://indianapublicmedia.org/amomentofscience/hang-on-sloopy/
http://www.sharkwatchsa.com/en/blog/category/482/post/1099/how-white-sharks-sleep/
http://www.birdsofseabrookisland.org/taxa/t000e-evidence5.html
http://www.theatlantic.com/technology/archive/2013/12/why-birds-can-sleep-on-branches-and-not-fall-off/281969/
http://www.rspb.org.uk/makeahom
