Narcolepsy is not a fatal disorder in itself. Narcolepsy has a great impact on functionability. Due to the excessive sleepiness, narcoleptics may fall asleep while driving and that is sometimes fatal. There are different levels of severity. Narcolepsy is usually treated with medication to improve alertness.
Hypersomnia is excessive sleepiness.
It is an excessively deep or prolonged major sleep period. It may be associated with difficulty in awakening. The first step is to consult a sleep specialist. Since the cause is still unknown, treatment consists of behavioral changes, good sleep hygiene and taking stimulants to help you be more alert. Avoid shiftwork, alcohol and caffeine.