Insomnia

Insomnia is a symptom of a sleeping disorder characterized by persistent difficulty falling asleep or staying asleep despite the opportunity. Insomnia is a symptom, not a stand-alone diagnosis or a disease. By definition, insomnia is "difficulty initiating or maintaining sleep, or both". It is typically followed by functional impairment while awake. Insomnia constitute a sleep disorder. It is a sympton of a disorder. Difficulty falling asleep. Definition maintaining sleep. sleep. sleep. sleep. sleep. Sleep!