Many things: Among the things measured include brain waves, jaw muscle activity, breathing rate, blood oxygen, pulse, chest activity, and abdominal activity.
Answered 3/21/2015
5.2k views
Surface electrodes: If you're worried about needles, don't. Everything that is attached to you is done with glue or paste. Be sure to wash your hair before you leave the sleep lab---the paste is really hard to remove once it dries.
Answered 12/16/2015
1.8k views
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