Have you tried deleting the bed and replacing it?
Next suggestion after that : Have you tried deleting the sim and recovering them ?
NOTE: The following will work only if you have two or more sims in your active family.
0) Transfer any inventory you want to retain off the sim and onto the lot, or another sim.
1) Use Ctrl-Shift-C to get the command console
2) type in : testingcheatsenabled on
3) type in : moveobjects on
4) Start up the "Build/Buy Mode" on your lot
5) Select the sim, and delete them
6) Close "Build/Buy Mode"
7) Go into "Edit Town"
8 ) Split the problem sim off from the household
9) Then merge the sim back into the family
10) Return to Live Mode, the sim should reappear on the lot somewhere.
11) Use Ctrl-Shift-C to get the command console
12) type in : moveobjects off
13) type in : testingcheatsenabled off
If that does not work, I would suggest exiting without saving, and reloading a game where the sim has not been deleted.
Good Luck.
(edit: Added Step (0) )