Sleep-Deprived EEG

What Is a Sleep-Deprived EEG?

A Sleep-Deprived EEG is a test that records your brain activity after you’ve had less sleep than usual. It helps doctors investigate symptoms like:

• Seizures or blackouts
• Fainting or confusion
• Night-time episodes that are hard to explain

The test is safe, painless and can help show patterns in your brain that are easier to spot when you’re tired or asleep.

What Happens During the Test?

• You’ll be asked to stay awake all night, or sleep less than usual (usually fewer than 4 hours)
• When you arrive for the test, we’ll apply small sensors (electrodes) to your scalp
• You’ll relax in a quiet room. You may fall asleep, which is helpful for the test
• The whole procedure usually takes 60 to 90 minutes

There are no needles, no pain, and nothing goes into your body. The test only records what’s happening in your brain naturally.

How to Prepare

• Try to stay awake all night or only sleep for a few hours (your appointment letter will confirm the details)
• Wash your hair the night before and avoid using gel, spray or oils
• Bring someone with you, as you should not drive afterwards
• Eat normally and take your usual medication unless told otherwise

After the Test

Most people feel tired and go home to rest. You should:

• Avoid driving or using machinery
• Sleep as needed
• Wait for your doctor to discuss the results with you. These are usually sent within a few days