Symptoms of hypersomnia may include:

• Persistent or recurrent extreme daytime sleepiness and difficulty remaining awake.
• Prolonged sleep of 10 or more hours without feeling refreshed.
• Difficulty waking in the morning or after a nap (sometimes called “sleep drunkenness”), potentially accompanied by confusion or combative behavior.
• Unrefreshing, nonrestorative daytime naps.
• Anxiety, irritability, decreased energy, or restlessness.
• Slowed thinking or speech, difficulty concentrating, and memory problems.
• Headaches, loss of appetite, or hallucinations.