I share your experience. I feel completely miserable on anything less than 6 hours, and I'm lucky to find myself getting anything done at all on those days. If

I share your experience. I feel completely miserable on anything less than 6 hours, and I'm lucky to find myself getting anything done at all on those days. If I sleep 9 to 10 hours, I do feel groggy/sleepy for several hours—it's not pleasant, but mellow grogginess/sleepiness is wonderful compared to the demoralizing mental and physical exhaustion I feel when I've not slept enough.