U cannot sleep at night......yes it is a disease

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A sleep disorder caused due to various conditions. Stress is one of the main reasons causing insomnia. The patient suffering from it, does not get natural sleep and has to be under medical guidance.

Insomnia is a sleeping disorder characterized by persistent difficulty falling asleep or staying asleep despite the opportunity. It is typically followed by functional impairment while awake. Insomniacs have been known to complain about being unable to close their eyes or "rest their mind" for more than a few minutes at a time. Both organic and non-organic insomnia constitute a sleep disorder.
At least three types of insomnia exist: transient, acute, and chronic.

Transient insomnia lasts from days to weeks. It can be caused by another disorder, by changes in the sleep environment, by the timing of sleep, or by stress. Its consequences - sleepiness and impaired psychomotor performance - are similar to those of sleep deprivation.[5] If this form of insomnia continues to occur from time to time, the insomnia is classified as intermittent.[citation needed]
Acute insomnia is the inability to consistently sleep well for a period of between three weeks to six months.
Chronic insomnia ...more

Insomnia is a sleeping disorder characterized by persistent difficulty falling asleep or staying asleep despite the opportunity. It is typically followed by functional impairment while awake. Insomniacs have been known to complain about being unable to close their eyes or "rest their mind" for more than a few minutes at a time. Both organic and non-organic insomnia constitute a sleep disorder.

Insomnia is not exactly a disease, but ii is sleeplessness. A person does not sleep the time he needs to have a good health.

Insomnia is lack of sleep that a person experiences.....; it is more a mental ailment than a physical one.........

Insomnia is a condition in which you have trouble falling or staying asleep. Some people with insomnia may fall asleep easily but wake up too soon. Other people may have the opposite problem, or they have trouble with both falling asleep and staying asleep. The end result is poor-quality sleep that doesnt leave you feeling refreshed when you wake up.

U cannot sleep at night......yes it is a disease