When I was teaching at one of the local SEA universities they had an entire room for lecturers to sleep during the 1.5 hour lunch break. It had double bunk beds maybe 30 or so. It was well used from 12pm to 1:30pm.
I'll tell you -- this was magic. Even just being able to sleep for 30 minutes (after getting lunch and catching up on my phone) between classes was rejuvenating.
I never had that 2pm "nod off", which I did when working in Western style jobs...
My point being this is a kind of bi-phasic sleep.