The hospital never gave me a checklist for what I need or really what to expect. Any advice?

I know there's wifi and that I'll probably be there for nap studies as well, but that's the extent of what I'm prepared for. I am thinking all I really need are a change of sleep clothes, next day clothes, toiletries, and my phone/laptop. Anything else I may need? I mean, it's just one night and day.

Has anyone done a nap study? Do they just expect you to nap on command?