Daytime sleepiness in depression.

Daytime drowsiness and other sleep related symptoms such as attention and concentration difficulties, blurred vision and slurred speech were evaluated using seven point rating scales in 51 drug free depressed patients and an age and sex matched control group. Degrees of depression and anxiety were quantified using the Beck Depression Inventory and State Trait Anxiety Inventory respectively. Daytime drowsiness and sleep related symptoms were seen to be significantly higher in the index group. Both depression and anxiety scores significantly correlated with daytime drowsiness.