Symptoms & Diagnosis
Currently, Non-24-Hour Sleep Wake Disorder (Non-24) is known to share symptoms that are similar to those found in other sleep disorders. Sleep patterns from previously recorded cases may give insight to certain signs to watch for. Although, recent work suggests that there is a large degree of variability of sleep complaints between individuals. Generally, the professional criteria suggest the presence of Non-24 if there is a complaint of cyclic insomnia and/or excessive daytime sleepiness, and that these abnormalities appear to be related to lack of synchronicity between the 24-hour day-night cycle and the internal body clock.