Your physicians may ask you to fill out a sleep diary or sleep log each day to document specific sleep and wake habits over a period of time. A sleep diary can be particularly useful in diagnosing and treating insomnia and circadian rhythm disorders.
A sleep diary can be a very helpful tool to gain more insight into your sleep problem, or to monitor whether a treatment is successful. Sleep diaries are normally completed once or twice a day. It usually consists of several questions related to sleep and wake times, nap times, caffeine and alcohol use and general mood or functioning.