Summary
Insomnia, also known as trouble sleeping, is a sleep disorder in which there is trouble to fall asleep or to stay asleep as long as desired.
While the term is sometimes used to describe a disorder as diagnosed by polysomnographic or actigraphic evidence, this is often practically defined as a positive response to either of two questions: “do you experience difficulty sleeping?” or “do you have difficulty falling or staying asleep?”
Initial Overview based on Wikipedia entry Jan. 3, 2016
OnAir Post: Insomnia Overview
