Have you ever crunched the numbers in bed to determine exactly how much sleep you’ll get if you dozed at that moment? How often have you been upset by the number you came up with? No matter when you wake up, most of the time it feels as if you never get enough sleep. Well, it may not be how many hours you’re getting, but how well you are timing your sleep cycles. The brain has a pattern of sleep, and goes through cycles of REM and non-REM sleep. This sleep calculator will tell you precisely when to go to bed in order to achieve the best sleep pattern possible.