I don't get migraines from lack of sleep, but I "need" ~8.5-9 hours (on average) to feel at my best. I can go on 5 hours once in a while and be okay, but I hav

I don't get migraines from lack of sleep, but I "need" ~8.5-9 hours (on average) to feel at my best. I can go on 5 hours once in a while and be okay, but I have to make it up later. I would LOVE to be able to perform well on 4 hours.