> Sleep Disorders

Insomnia is the inability to sleep, or to sleep satisfactorily, and is the most common sleep disorder. It may involve restless or interrupted sleep,

a reduction in the usual time you spend sleeping or, in rare cases, complete wakefulness. Insomnia is a symptom rather than an illness in itself: in the majority of cases, sleeplessness has an underlying cause. When no underlying cause can be found, a person is said to be suffering from primary insomnia.

Read more: Is insomnia what you have?

Definition:

Insomnia is the inability to sleep, or to sleep satisfactorily, and is the most common sleep disorder. It may involve restless or interrupted sleep, a reduction in the usual time you spend sleeping or, in rare cases, complete wakefulness. Insomnia is a symptom rather than an illness in itself: in the majority of cases, sleeplessness has an underlying cause. When no underlying cause can be found, a person is said to be suffering from primary insomnia.

Read more: Insomnia

For seven or eight hours per day, we go into a profoundly different state – a system – shutdown,

if you will. But how much do you really know about sleep, about why we need it and what happens while we have our nightly shuteye?

Read more: Interesting facts about sleep