Few are aware of the importance of good sleep, not necessarily measured by hours in bed, but the quality of sleep. This has been indicated by sleep polls over the past few years. The National Sleep Foundation's 2018 poll or survey was up slightly in hours of sleep, but still low in quality of sleep.
Sleep quality is important for more-than-quality daytime or waking hours performance. It is a vital part of our immune system and efficient cellular repair that may slow down the body’s aging process.
It doesn’t matter much if you’re in bed during sleep time for eight hours if your sleep is not deep, or if it’s not cycled through the five stages of sleep with proper duration for each cycle, there is some measure of sleep deprivation.