A lot of sensor pads haha They'll put them on your head, face, chest, limbs. It can be difficult to fall/stay asleep with them, just because you'll end up pulling on a lead or having one between your head and how you want to lay on your pillow, they do a pretty good job of running the leads under your clothes and keeping them together considering.
They also kept me the following day after seeing some of the initial results of my sleep test. I was 'forced' to hang out in the room and watch tv or read and then take naps. What a tough day that was.