Two good hints
1.If you put ctrl shift and c on your keyboard you end up with a grey box in the corner.
Then put MOVE_OBJECTS ON then press enter then the gray box will disspaear then tell your people go in the bed and play.
Then when they are under the cover pause it then move the bed and look.
2.If you do the same MOVE_OBJECTS ON save it then delete your ceareter click on there pictue and your sim is healthy.
From games guru (James Hanson)
More tricks, tips and cheats for this game are right here - The Sims: Unleashed cheats
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