I'm having a similar, although different, problem. When I invite my lover to stay the night (they are dating), they will woohoo, but the NPC partner will never stay in the bed to actually sleep. They will just roam around all night while my sim sleeps in the bed. I know for a fact that the visitor NPC partner is definitely tired, because they have passed out on the floor twice (wouldn't even nap on the couch.) Not a pathing issue, sims can get to every part of the bed and couch just fine. It's an issue with the scripts not allowing an NPC partner to sleep in my sim's bed (or even their house, maybe?...) Full romance bar, friendship above 50%. There should be no issue with them sleeping in the same bed. I never had this issue back in November, when I was first playing Sims4 on PS4. I stopped playing for a couple months in hopes the issues then would be fixed, but it seems I've come back to an entirely new crop of glitches and bugs. It would be nice if they could sleep in the same bed again. I've never tested it with my sim having full energy, to where I get my sim yelling at the NPC partner for sleeping in their bed. Maybe that would happen to me, too. They just...woohoo, my sim falls asleep, the NPC partner gets up immediately, wanders around all night, and either passes out or leaves very early in the morning. (I also noticed the visiting NPC partner hasn't taken any food from the fridge. Maybe the hunger status has never been low enough? Might be tied into the sleeping in the bed permissions, though.)
*EDIT*
Note that I am playing on console, PS4. I can't find the issue listed specifically for console version.
The packs I have installed:
Sims 4 Deluxe (Life of the Party, Up all Night, Awesome Animal Hats)
Vintage Glamour
City Living
Dine Out
Luxury Party
Cool Kitchen
Perfect Patio
Romantic Garden
