Anyone keep snake tubs Under Bed?

I am brainstorming Ideas for the new rack system I want to build... But my main problem is space. The thought came to me what if I raised the bed up a little and had a couple 2 or 3 high racks under the bed. That would help me save some space. Has anyone done this before?
Couple of questions...
I would have it stable so that motion in the bed would not disturb the bins... But would the sound of us crawling in and out of bed... or anything else(;)) cause them stress?

I live in a dorm, so the only logical place for my tubs to be is under my bed. I dont have any problems with stress, all my snakes eat, poop, pee, and shed just fine, and are all sweet and gentle. I dont see any problems with keeping my little ones under my bed!

Do you have them on a rack or in loose tubs..And how do you heat them? I hate being hot when I sleep... Do you ever feel any heat emitting from underneathe?

I have them loose, two 32 qt stacked on top of each other and two 6 qt stacked on top of each other. I have uth heating pads, two zoomed and two from reptilebasics.com. I dont have a problem with heat coming up to my bed at all, at least not that I have noticed.