I usually get around 7-8 hours, but I often wake up during the night. I've found that I can get away with 3-4 hours and feel fine, but only for one night - if i

I usually get around 7-8 hours, but I often wake up during the night. I've found that I can get away with 3-4 hours and feel fine, but only for one night - if it's two nights consecutively then I feel terrible.