Insomnia

Insomnia, also known as sleeplessness, is a sleep disorder causing difficulty falling asleep or staying asleep for as long as desired. Insomnia is typically followed by daytime sleepiness, low energy, irritability, and a depressed mood. It may result in an increased risk of accidents as well as problems focusing and learning.

Insomnia can be short-term, lasting for days or weeks, or long-term, lasting more than a month.
The concept of the word insomnia has two distinct possibilities: insomnia disorder or insomnia symptoms.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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