Frequent sleepiness during daytime may indicate that you have nacrolepsy. Nacrolepsy, characterized by sudden desire for sleep and overwhleming daytime drowsiness, is a long-term neurological sleep disorder that demonstrates incapbility of regulating sleep-wake cycles. Usually, nacrolepsy can attack you at any time during the day and last from minutes to hours, which seriously disrupts your daily routine.
The exact cause of narcolepsy is unknown, but professionals suggest that nacrolepsy is mostly possible to be resulted from the loss of hypocretin, which is caused by an autoimmune reaction. Genetics, in other words, family history, is also believed to be a major cause of narcolepsy.