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Insomnia is a sleeping disorder. When a person cannot sleep properly, it results in daytime fatigue, lethargy, emotional instability, impaired memory, dizziness, irritability, poor performance. Insomnia can be of three types – temporary, which lasts for a few days, short-term which lasts for two or three weeks, and chronic insomnia which lasts for more than a month. People with sleep disorder may experience waking in the bed at night, inability to sleep despite being tired, not feeling refreshed even after sleep, waking up too early, etc.