How much sleep is best for an individual?
How much deep sleep one need?
How can you max out REM sleep? How many hours of sleep does a kid need? Is 6 hours enough sleep? How much should I sleep as a teenager? What's the ideal ratio of light, deep, and REM sleep? How important is sleep? What are some tips for making the most of your Sleep No More experience? How many hours do you sleep (day & night) per day? I am 16 year old. How many hours should I sleep? I have been sleeping for 4 hours a day apparently, is it normal? Why do we need eight hours of sleep? How many hours do successful people sleep per day? Why does your body need 8 hours of sleep? How many hour students sleep? Is a Sleep Number bed worth the cost? How many calories do I burn while sleeping? How do you sleep 7 hours a day? Is sleep important? How do I avoid sleep so much? How can I lose weight in my sleep? How many hours of focused, detailed work can a person reasonably do in a 24-hour period, before needing sleep? What's the best way to get sleep? Is 6 hours of sleep enough for a 17 year old? Is it healthy to sleep for 12 hours a day? Why or why not? How do I sleep 7 hours a day? Do people who need less sleep get a higher percentage of REM or slow-wave sleep? How do I have a good sleepover? How do I sleep 5 hours a day? How can I reduce my sleep? What is the maximum numbers of hours a normal person can stay awake and concentrate on anything without sleeping? Would this make you insomniac forever? What is the ideal amount of sleep time that a teenager needs to be healthy?