Why 8 Hours Of Sleep Matters
I’ve always heard that eight hours of sleep is the optimal amount of sleep every person needs, but I honestly get around 6-7 hours each night. After about that long, I start waking up and my brain starts thinking… and then I can’t get it to stop. After a while, it’s really just me lying in bed thinking about “stuff.” I don’t think it’s stress, I just think that I get enough sleep and my brain and body are just ready to get on with the day. After a certain point, I guess my body is tired of sleeping. 
New scientific research shows that going without enough sleep for more than an occasional day or two can wreak havoc on your health, memory, concentration, mood, and ability to make decisions - even if you think you’re doing fine.
I can recognize the signs of being tired. My brain gets a little duller, I have a harder time understanding and following what I read, and I start getting hungry when I know I’ve just eaten (it’s my body starving for energy because I’m tired I think). When I recognize that, I usually don’t try to fight through it, I do something else or I take a quick nap. Even if I don’t actually fall asleep, the break helps me power through rather than just drinking coffee or soda.
Anyway, it seems like the experts are now confident that 7-8 hours a night is the optimal amount. Sleep more and your waking hours will be more effective.
Make sleep work for you [Fortune Small Business]
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