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Insomnia

Persistent inability to fall asleep or maintain sleep despite feeling fatigued.

Example: A patient falls asleep without much difficulty, but awakens every two hours thereafter and has trouble getting back to sleep.

Insomnia
APA Reference
Grinnell, R. (2016). Insomnia. Psych Central. Retrieved on July 13, 2018, from https://psychcentral.com/encyclopedia/insomnia/