When I was in college and staying in the dorms, our room came with bunkable beds. As a result at least one bed had high posts. Luckily our beds were flippable. You could flip them either way and put the taller part of the post facing down to give you more ground clearance. It was enough clearance to lean the bike in against the wall without removing anything. Even with the "short post" there was more than enough clearance to hang my MTB sideways under my bed. I just took a U-luck and strategically looped it around some of the springs. Then to store my bike, I would just slide it in there and suspend it by the seat-tube. The front end was nicely supported by the end of the handlebar. I didn't have to remove wheels or anything.

Another trick we learned was to cram a bookshelf against a corner wall, strategically place the desk a bedlength's away and put the bedposts on the bookshelf and desk. With the tall-posts of bunkbeds down this created a very high bed and a lot of room underneath. Although I had heard that some people's beds fell down, I think it was rare if "constructed" properly. Some people also used brackets and straps into the walls to keep things from shifting. The only issue is that if you sat up abruptly and had a long torso, you might bang your head on the ceiling. Climbing into and out of bed also required a high stepstool or coming up the desk. And keep those sheets tucked tight so you don't roll over and drop six feet onto the hard dormroom floor (ours was concrete with a light high-traffic carpet cover).