I don't see why not.
On the other hand, as someone who has a sleeping disorder I'll tell you right now you should avoid doing anything other than sleep in your bed. By doing work in bed, you'll subconsciously associate your bed with work, and you'll get problems sleeping or have lighter sleep and things like that.
As far as PR working in bed, sure, it should I would guess.
-Ramon http://razor.ramon.com
