One of the couples for the reason of this thread are my In Laws.
In 2021 I went on a Stag Weekend with my Brother in Law and shared a bed.
We did half of the famous Leeds Beer Run and even filled with beer I didn't get one wink of sleep being in the same bed as my Brother in Law.
I'd seen nothing like it, the noises he made were worse than snoring and at least 3 times he hit me with his flailing arms.
At one point I collected spare pillows etc to try and sleep on the floor, it failed.
I then pushed my wheelchair as far away as I could from him and filled it with pillows etc to try and get to sleep, it failed.
The following day I went down to reception to see if thy had a spare room, normal days were £38 but this weekend was £230.
I then got more drunk during the second stage of the Beer Run and I actually slept until the alarm went off

I can understand why my In Laws sleep in separate rooms.