Hypersomnia refers to excessive sleepiness and it is characterized by an individual having difficulty staying awake throughout the day. Hypersomnia due to a medical disorder neuromuscular disorders such as muscular dystrophy als or myasthenia gravis. Pin By Amy Herring On Health Idiopathic Hypersomnia Sleep Apnea Hypersomnia which refers to either excessive daytime sleepiness or excessive time spent sleeping is a condition in which a person has trouble staying awake during the day. Hypersomnia with sleep apnea . Scientists calculate that approximately 4 6 of the world s population suffers from conditions that increase sleepiness. Secondary hypersomnia is the result of conditions that cause fatigue or insufficient sleep. Hypersomnia with sleep apnea. In the fifth edition of the diagnostic and statistical manual of mental disorders hypersomnolence of which there are several subtypes appears under sleep wake disorders. As previously noted secondary hypersomnia can be caused b...