According to scientists in the 20th century, when we are asleep it is not a passive withdrawal from the world.

Basically there are two types of sleep: a quiet phase and an active phase.
These two sleep types can be differentiated by differences in psychology, biochemistry, behavior and physiology.

As you are asleep your brain undergoes some changes (electrical activity measured at the scalp) eye movements.

The quiet phase of sleep can be described as a state of restful inactivity—In this state you will continue to breathe slowly and deeply Your mind does little but your metabolic rate is at a minimum,This process tends to.....Read more