I had a sleep study done at MGH a few years back. I don't know how most hospitals do it, but MGH commandeers a floor at the Holiday Inn for it, so it's a legit bedroom and pretty comfortable, all things considered. They do stick tape in your hair to attach the electrodes to your head, so keep that in mind, and you may want to shave your legs beforehand. Because, again, tape. That was the worst.