People with this disorder might find it difficult to follow a regular clock scheme, as their biological clock can shift so much that they are sleepy during the day and experience insomnia during night. Another common diagnostic feature is the cyclical nature of<unk> -24: people will experience certain periods, whether they be weeks or months, of sleeping during the day (symptomatic periods) that alternate with periods of sleeping during normal nighttime<unk> s (asymptomatic periods). Symptoms reported by patients forced into a<unk> -hour schedule are similar to those of sleep deprivation and can include: * Apraxia including ideational apraxia, ideomotor apraxia, kinetic apraxia, limb apraxia, verbal apraxia * Cognitive dysfunction * Difficulties concentrating * Confusion * Depressed mood * Diarrhea * Extreme nausea * Extreme fatigue * Hair loss * Headaches * Impaired balance * Photosensitivity * Joint pain * Loss of muscle coordination (ataxia) * Menstrual irregularities * Muscle pain * Suicidal thoughts * Weight gain * Hallucinations
Non-24-hour sleep–wake disorder
Circadian rhythm sleep disorder
Delayed sleep phase disorder
Irregular sleep–wake rhythm
Advanced sleep phase disorder
Shift work sleep disorder
Excessive daytime sleepiness
Sleep state misperception