You should be able to calibrate the tracking so that the Rift can be used in a bed, in fact you should be fine moving it from bed to bed if you move the sensors in near enough the same place at each location. They will probably have to be able to move their chins down otherwise they'll be stuck looking up all the time I think though.
Google Earth VR will be amazing for them to try, as will TheBlu, and they can watch films etc using Virtual Desktop in a virtual cinema.
And you can see what they're seeing after they start a game/experience for most games but some you can't, and you won't be able to see what they see in Oculus Home either.
The Oculus sub-Reddit is the place I go to for VR discussion, you might want to post there and ask these questions because there might be people on there that have used the Rift in a similar way and can give you a few pointers.
😄 https://www.reddit.com/r/oculus/
