Just like air, water and food, sleep is essential to human beings. We can cope without sleep for short periods of time, but the longer sleep is deprived, the greater the urge to sleep becomes.
The exact role and function of sleep has been a topic of debate for researchers, but most agree that sleep serves as both psychologically and physiologically restorative purpose. Delta sleep (stages 3 & 4 – deep sleep) is thought to be most involved with restoring the body and physical energy, while REM sleep (dream sleep) is most important for restoring mental function such as memory and concentration.
Sleep is important for:
|General physical health
||Concentration and memory
|Psychological well-being and mood
|Repairing injuries or illness
||Getting along with others