Insomnia is the lack of sleep due to the inability to stay or fall asleep. In addition, it comes in three main forms: sleep-onset (difficulty falling asleep), sleep-maintenance (waking one or more times during the night and not be able to fall asleep), and early-awakening insomnia (waking up way too early and staying up). It’s possible to fit in one or more of the above categories. In addition, it can range from adolescence to the elderly, even infants can undergo insomnia.
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