''We don't want couch potatoes.''
NASA wants to pay volunteers £7,000 each to stay in bed for 10 weeks.
Experts at the Flight Analog Research Unit in Texas are searching for people to remain in their bed for 24 hours a day over the course of 10 weeks in a bid to test what physical changes will happen on space missions.
Lucky applicants will have their heart and circulatory and nervous systems examined as well as their bones and muscles over the 10 weeks, and they won't even have to get out of bed to wash thanks to a special modified shower.
As well as sleeping a lot, the volunteers, who will each he paid £6,849, will be allowed to watch TV and surf the internet, but they must be fit and non-smokers.
A spokesman said: ''We don't want couch potatoes.''