A person who likes to make the bed bounce. It can be for several different reasons -- having sex, jumping of joy, jumping to bed instead of laying on it carefully and making the other person on the bed bounce.
http://interiordec.about.com/od/beds/a/bedsizes.htm
http://en.wikipedia.org/wiki/Bed
The pages above say that a 140x200cm bed is slightly narrower/shorter than a Queen (153x203cm / 152x203cm) and...
It depends you could say you have to be on the bed, or you have to be in bed. If you are referring to having to be asleep at or having a bedtime, the correct form is "have to be in bed"