I had the pleasure to sleep on the top bunk (while my niece and DW slept on the queen bed). I hate it. I'm a small person, but I frequently toss and turn while sleeping. Throughout the night, I kept hitting the wall!!!! It's very tight up there.
All right, the reason why I slept on the top bunk is not because I was in the dog house with DW, but my 5 yr old niece fell off "head first" from the top bunk on the first night, so on the second night, I slept there. But on the third night, I squeezed in with DW and niece.
I really don't like the "SM all" bunks.