Sleep and Sleep disorder

Abstract

Normally, adults should sleep about 7-9hours per night but this can vary between individuals based on their gender, age, occupation...etc. Sleep is not just the absence of wakefulness rather it is a complex and multi-dimensional state.1 It influences all major body system. Sleep is important for physical, emotional health and well-being, it also plays a role in memory and learning consolidation.People who do not get enough sleep lose insights into the effects the sleep deprivation is having on their day-day functioning.

There are two stages of sleep; NREM sleep and REM sleep. NREM sleep involves decreased brain activity. The brain wave pattern is Theta wave and Delta waves. As the sleep deepens, the brain waves become slow and gain amplitude. It is divided into 3 stages; N1 (time of drowsiness), N2 (period of light sleep) and N3 (slow wave sleep). it is most difficult to wake people from this stage and some children bed-wet, experience night terrors or sleep walk in this stage.