This cell had one man in it, curled up on the upper bunk, not moving.
Robinson was sitting on the edge of the upper bunk.
A major's head appeared over the edge of the upper bunk.
"How would you like to sleep in the upper bunk?"
You'll have to share one upper bunk as best you can.
She had the upper bunk on one side, he the lower on the other.
Once we were under way it would be the upper bunk on the right.
When he was gone, I looked up at that upper bunk.
They sat on the edge of the bed and leaned forward so their heads didn't hit Big's upper bunk.
The material of the upper bunks by themselves might not be sufficient.