How do you diagnose hypersomnia?
If you consistently feel drowsy during the day, talk to your doctor. They'll ask you about your sleeping habits, how much sleep you get at night, if you wake up at night, and whether you fall asleep during the day. They'll also want to know if you're having any emotional problems or taking any drugs that may be interfering with your sleep.
Your doctor may also order some tests, including blood tests, computed tomography (CT) scans, and a sleep test called polysomnography. In some cases, an additional electroencephalogram (EEG), which measures the electrical activity of the brain, is needed.
From: Sleep and Hypersomnia
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