Sleep apnea, narcolepsy, depression and restless legs disorder can cause excessive sleepiness, notes WebMD. Not getting enough sleep also leads to excessive fatigue. Polysomnography, electroencephalogram and genetic bloo... More » Health Conditions & Diseases

The website of the American Academy of Sleep Medicine provides a search tool for finding doctors who specialize in sleep disorders, states WebMD. The American Academy of Dental Sleep Medicine provides a similar tool for ... More » Health Conditions & Diseases

There are several different methods suggested by doctors for the treatment of night terrors including changing medications, treating underlying causes, imagery rehearsal treatment and therapy, according to WebMD. Night t... More » Health Conditions & Diseases

Sleep myoclonus, restless leg disorder and periodic leg movement during sleep are sleep-related disorders that cause involuntary muscle twitches, jerks and spasms, according to the American Sleep Association. Sleep myocl... More » Health Pain & Symptoms

Some causes of excessive sleepiness include underlying conditions such as depression and sleep disorders, the use of particular medication, drugs, alcohol or smoking, states WebMD. Lack of enough sleep, which is sometime... More » Health Conditions & Diseases

The Mayo Clinic reports that Adderall is used to treat attention deficit hyperactivity disorder, or ADHD, and narcolepsy, and both adults and children are prescribed Adderall to treat these conditions. ADHD is a psycholo... More »

Possible medical causes of yawning include narcolepsy, sleep apnea and medications that treat anxiety or depression, according to Healthline. However, the more common causes are boredom and fatigue. Yawning may occur on ... More » Health Conditions & Diseases