The only thing my body tells me in the morning is.. "dude coffee now". I have no problem falling asleep, but I usually wake up pretty early. I feel ok with 6 hours of sleep, but I don't think that is optimally healthy. I don't worry about it a lot, but I look at sleep duration, heart rate, hrv, and sleep debt. The details motivate me to pay attention to sleep hygiene. If I ignored it, I don't think I would sleep enough.