[otoburb]

Maybe not 'exclusively' slept, but koalas[1] sleep for a majority of the day (16-20 hours) in order to digest highly toxic eucalyptus leaves which constitute the main portion of their diet.

[1] https://en.wikipedia.org/wiki/Koala

[4b11b4]

Maybe I should really lean into that nap after eating..

[_alternator_]

Or quit eating poison :P

[lr4444lr]

Fascinating. I wonder whether they'd sleep less if fed a less toxic, more easily digestible diet.

[SAI_Peregrinus]

Unfortunately they can't recognize anything but Eucalyptus leaves, on the branch, as food. A pile of the leaves isn't food to them, they won't eat it.

[jjk166]

But that's a case of requiring additional sleep for a specific purpose