June 11, 2012 —

Science Daily/American Academy of Sleep Medicine

A small study of Toronto college students is shedding light on a contributing factor of insomnia that might be hard to admit -- an adult fear of the dark.

Nearly half of the students who reported having poor sleep also reported a fear of the dark. Researchers confirmed this objectively by measuring blink responses to sudden noise bursts in light and dark surroundings. Good sleepers became accustomed to the noise bursts but the poor sleepers grew more anticipatory when the lights were down.

"The poor sleepers were more easily startled in the dark compared with the good sleepers," said Taryn Moss, the study's lead author. "As treatment providers, we assume that poor sleepers become tense when the lights go out because they associate the bed with being unable to sleep. Now we're wondering how many people actually have an active and untreated phobia."

http://www.sciencedaily.com/releases/2012/06/120611092343.htm