
 Originally Posted by 
MuscleInk
					
				 
				Recalling back on some of the earlier work I did on circadian rhythms, brain function, aging, and health, quantity of sleep may play a much smaller role in overall health compared to quality of sleep and this quality of sleep has as much to do with a routine schedule versus one that is fragmented or variable. This does not presuppose that quantity of sleep is unimportant - a number of recent studies show an increased deposition of beta amyloid and plaque pathology (one of two dominant pathological markers of Alzheimer's disease) among individuals having less than 6 hours sleep per day or more than 9.5 hours of sleep. Moreover, as the amyloid accumulates in the brain, sleep cycles become more impaired. Clearly, amount of sleep is an important factor.
From a general health perspective, it is believed that a consistent sleep schedule is more important for recovery and overall brain function than quantity. In other words, if you normally go to sleep from 10PM to 6AM, keeping with this schedule is more important for maintaining health than someone who goes to beed at 1AM one night and 9PM the next. Many of us have probably experienced this on the weekends when we tend to follow a different schedule than what we do through the week, and as a result, many may feel excessively tired on Sunday or Monday morning because of the disruption to your normal circadian clock in the brain that regulates sleep and wakeful periods. As a side bar, quality of sleep also refers to how much time is spent between REM and deep sleep stages; the latter being more important for physical repair, the former for mental well being.
There is also evidence that a nap during the day can improve overall well being and general health - much like recharging a battery before it is drained to zero.
Among body builders and recreational fitness enthusiasts, we push ourselves harder and expend more energy than people who follow a sedentary lifestyle and there is little doubt that rest (and perhaps more of it) is essential to recovery, growth, and well being.