I can at least say when I am habitually sleep deprived I find it easy to fall asleep on a whims notice. If I get a proper 8-9 hours of sleep, I find it impossi

I can at least say when I am habitually sleep deprived I find it easy to fall asleep on a whims notice. If I get a proper 8-9 hours of sleep, I find it impossible to nap. Maybe the insta-napping is only possible due to a more fundamental lack of sleep issue?