I had one like 10 years ago. They attach a bunch of electrodes to you and you go to sleep, no big deal. The nap test is a killer though. They let you sleep for like 20 minutes, the wake you. Then you stay awake for like thirty minutes and nap again. After doing this a few times I was exhausted. When your trying to stay awake, all you can think about is falling asleep again.
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