I'd guess this goes back to not getting enough healthy sleep, which is a reason people nap.

3 hours ago | parent | next [-]

[deleted]

Except intentional napping, which could be "yawn, I slept bad last night; I'm gonna go take a nap" is not a risk.

	▲	cestith an hour ago \| parent [-]
		Poor sleep when intended could also be a reason for falling asleep without planning to do so.