Eli5: what is insomnia

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I don’t know what it is, but would like to know

In: Biology
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Insomnia is the inability to fall asleep. It is 3:30 am in Texas, I am not awake on purpose

It’s a sleep disorder. It can either mean someone has difficulty falling asleep or they have difficulty staying asleep. Usually it’s caused by sleeping habits, such has screen time in bed or irregular sleeping patterns; but it can also be caused by a lack of something called ‘melatonin’, which is basically the chemical your body uses to send you to sleep. Some people, like me, just don’t naturally produce enough of it.