My sims won't sleep in the same bed as their spouse

@Sunnylicii16  Hi, just to clarify, are you playing Sims 3 or Sims 4?

Either way, please sell the bed your sims are using, then buy a new bed (from the vanilla game, not a custom content bed), place it in the middle of a different room with nothing else around it, or better yet outside, and see if your sims will use it properly.  Please test twice: tell one sim to sleep before the other, then reverse the order.  You don't have to save your progress.