|Hypersomnia is excessive sleepiness. It is a condition in which a person has trouble staying awake during the day. People with hypersomnia fall asleep at any time for instance, at work or while they are driving. People may also have other sleep-related problems, like lack of energy and trouble thinking clearly. There are several potential causes of hypersomnia, like: The sleep disorders narcolepsy i.e. daytime sleepiness, sleep apnea i.e. interruptions of breathing during sleep and not getting enough sleep at night (sleep deprivation, Being overweight, Drug or alcohol abuse, Low thyroid function, A head injury or a neurological disease, such as multiple sclerosis Prescription drugs, such as tranquilizers. Symptoms of Hypersomnia often develop slowly during adolescence or young adulthood. like: Daytime naps that do not relieve drowsiness, Difficulty waking from a long sleep, may feel confused or disoriented, Increased need for sleep during the day at work, or during a meal or conversation Increased sleep time up to 14 - 18 hours per day. Hypersomnia is usually treated with medications such as amphetamine, methylphenidate, and modafinil. These drugs may not work as well for this condition as they do for narcolepsy. Important lifestyle changes that can help ease symptoms and prevent injury include: Avoiding alcohol and medications that can make the condition worse.