Not Sleeping Through the Night

Is it a gallery house, premade lot or one you built? If it's a pre-furnished gallery house or premade lot, there may be a wall speaker or other music device lying around somewhere nearby. If you can't find one, clear all the furniture and decorations out of the room (except the bed) and stash them in your inventory temporarily and see if that helps. You can also try to give the sim a more comfortable bed. You shouldn't have to mod your game, there's something going on that should be fixable. Another thought, do you have any cc that might be outdated?

If you can't track down the issue the other thought is, if the game is a new one you've started recently, save the sim to your library and then drop him/her into a brand new save game and see if that clears the issue for you.