Hypersomnia is sometimes misdiagnosed as narcolepsy
where a person experiences a sudden onset of sleepiness. The causes can be genetic, brain
damage or medical disorders such as clinical depression, uremia and fibromyalgia. Sometimes hypersomnia may be other sleep disorders such as narcolepsy, sleep apnea, and restless leg syndrome. Your symptoms may be linked to depression.
You should consult a psychologist for a complete medical and psychological workup.