And here’s the real key: to maximize the process of the brain being washed properly and HGH being produced excellently so you expand your creativity, productivity, vitality and longevity, you need five complete ninety-minute sleep cycles. That’s what the scientific studies are now confirming. That’s seven and a half hours of sleep each night. You also should know that research proves that it’s not only sleep-deprivation that kills. Over-sleep, nine or more hours, also has been shown to shorten life.”