Sleep researchers are shedding light on a contributing factor to insomnia maybe hard to admit -- an adult fear of the dark. A pilot study reports that nearly half of the students reporting poor sleep also were found (with objective measurement) to have a phobia of the dark. Researchers said traditional insomnia treatments might not work for these patients, and suggest they be adapted to account for the dark-related phobia.

Source: Some adults with sleep disturbances are actually afraid of the dark, study says