A few people have reported glitches where sims in their household become unable to interact with other sims and when they try to sleep they get bounced out of the bed shortly with no animations. Then when saving the game and coming back in, the sims with the problems become greened out and unselectable for any commands.
I just had that happen to me for the second time and I have found a work-around for this:
1. Go to Edit Town, select the household and evict the household with the lot.
2. When the household gets sent to the clipboard, select it from the clipboard and save it to the library.
3. Open a new game in a new town.
4. Select a lot and move your household and lot in.
5. Select the household and play them for a few seconds to make sure the previously glitched sims are selectable and can interact.
6. Go back to Edit Town, evict the household, and save the household to the library (delete the old version from the library first).
7. Go back to your glitched town, move the newly saved-to-library household with their lot back in (you may need to bulldoze the old lot).
8. Start playing your household again in their old neighborhood.
All my sims that were glitched are working now. However, all the school progress my teen sim had made was lost and she is starting out with a C grade again, so I doubt she will be valedictorian. My teen sim also lost her discovered potions, sigh.