Check out this job on offer from NASA, who need people to lay in bed for 90 days straight, something to do with tests for checking the effects of gravity, you have to lay in bed with your feet up.....and did I mention that you get paid $5000 per week.
If I was a US citizen I would be applying for this, the application form is linked to on this article page about it..
NASA Offers $5000 a Month For You to Lie in Bed | Wired Science from Wired.com
If anyone applies let us know, I want to hear what its like , as I have only ever dreamed of doing that.