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
The fact that organisms spend about a third of their time in sleep, and that sleep deprivation can have disastrous effects ultimately leading to death demonstrate the importance of sleep. The development of improved imaging techniques like EEG, PET and fMRI, along with high computational power have led to an increasingly greater understanding of the mechanisms underlying sleep.
Starting point is Wikipedia entry, November 3, 2014 and Wikipedia entries for Sleep and the Insomnia Hub.
OnAir Post: Sleep Overview
Their findings, which appear in the journal PLOS Biology, enhance our understanding of how sleep-wake cycles are regulated and offer promise for addressing related afflictions.
He also discusses how these findings have significant implications for future therapies – related to eye disease as well as mental illnesses. Click on the title to see the video.
