Most individuals require seven to nine hours of sleep per night, with teenagers requiring no less than nine hours. The majority of people are over 80% sleep deprived, with symptoms of increasingly irritable, shorter attention span, shorter learning ability, increase in accidents, blood pressure problems, heart problems, and lower effectiveness of the immune system. What does all of this tell you about what happens to us when we sleep?
Compared to the simple animals, the higher levels have a higher advanced need for sleep. This is because the nervous system is more important to their body's functions, due to a high-maintenance system. Higher levels require more rest and restoration than the simple animal levels. Sleep will have evolved into higher cycles of activity and rest, with more of a need to restore the nervous system throughout the sleep cycles. And as a person sleeps, waste products are removed in the body, primarily through the nervous system. Between our bodies' cells are located neurotransmitters and hormones, building up to the point of needing their removal periodically. The more active the body's cells, the more the chemicals will actively build up. To clean this overload up will require the firing of neurons throughout the night.
In animals this can be dangerous, as sleep goes in cycles which in people are approximately 90 minutes eachdeep and restoration sleep are followed by coming back up, then toward wakefulness, with the cycle being repeated until a wakened state occurs. Considered to be Stages 1, 2, 3, and 4 that are followed by REM, which is when most dreams occur, they all will keep reoccurring until wakefulness.
With insomnia occurring in about 10 to 15 percent of the public, serious causes such as stress, anxiety, caffeine, stimulants, daylight savings time, or even work schedule changesall can occur which prevents the body from healing itself due to lack of sleep. Adults may need seven to nine hours a night, but children require about 10 to 11 hours per night, with teenagers requiring nine hours. Considered an individual thing, sleep is considered to be what is needed to make a person feel not cranky or foggy-headed.
If resting and sleeping causes wonderment about its purpose, spend some time watching the animals. Simple levels of animals sleep whenever they can and as much as they can. The purpose of resting seems to be the conservation of their energy or the restoration of the organismssuch as clearing out waste products in the body which has built up during the energy activity.