In the animal kingdom, sleeping can be dangerous. Lying completely motionless and unconscious for hours at a time is just asking for trouble. There are, however, some sleepy risk-takers who spend almost all of their days snoozing.
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Sources:
General:
https://www.semel.ucla.edu/sites/default/files/sleep/publications/Mammalian_Sleep.pdf
https://www.nature.com/articles/s41467-019-08806-w
http://www.bu.edu/phylogeny/
Brown Bat:
http://biology.kenyon.edu/roth/Leskuetal.2008SMR.pdf
https://www.semel.ucla.edu/sites/default/files/sleep/publications/09phylogenyNatureReviewsNeuroscienceSiegel.pdf
http://www.nsrl.ttu.edu/tmot1/eptefusc.htm
Koalas:
http://www.publish.csiro.au/zo/ZO9850655
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0080366
https://link.springer.com/article/10.1007/BF00689622
https://www.sciencedirect.com/science/article/abs/pii/0031942273807010
Opossum:
https://animaldiversity.org/accounts/Didelphis_marsupialis/
https://www.sciencedirect.com/science/article/pii/S0166432806002476
https://onlinelibrary.wiley.com/doi/abs/10.1002/dev.420130502
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5573803/
https://www.sciencedirect.com/science/article/pii/S0149763414001997
https://onlinelibrary.wiley.com/doi/abs/10.1002/dev.420020407
Human infants:
https://www.stanfordchildrens.org/en/topic/default?id=infant-sleep-90-P02237
https://www.sciencedirect.com/science/article/pii/S0896627304006452
https://books.google.ca/books?hl=en&lr=&id=U2lnDAAAQBAJ&oi=fnd&pg=PT405&dq=infant+sleep+function&ots=cm_5_gc3A6&sig=1er6X48dfRRwDm4EtQa5likxkBk#v=onepage&q=function&f=false
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3034236/
https://www.jstor.org/stable/40064433?read-now=1&seq=2#page_scan_tab_contents
https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1467-8624.2010.01507.x
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5440010/
https://www.sciencedirect.com/science/article/pii/S0896627304006452
https://www.sciencedirect.com/science/article/pii/S1527336908001323
Nine-banded Armadillo:
https://www.sciencedirect.com/science/article/abs/pii/0031938473903107
https://www.karger.com/Article/Abstract/123659
https://www.tuck.com/stages/
https://www.researchgate.net/publication/241038063_Life_on_the_Half-Shell_Consequences_of_a_Carapace_in_the_Evolution_of_Armadillos_Xenarthra_Cingulata [PDF]
Fruit flies:
http://advances.sciencemag.org/content/5/2/eaau9253
https://www.sciencemag.org/news/2019/02/scientists-say-every-animal-needs-sleep-these-fruit-flies-didn-t-get-memo
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