I figit at night as well and am often quite restless, the pump is pretty tough and you can roll over on it without damaging it, i got a white soft belt with my pump which is great as you can then position the pump where you want it, you could always attach it to your arm, my place is an icecube and i have a pj hoodie with a pocket and i usually put it there, it does fall out during the night but i haven't damaged it yet. I think the pumps are made quite tough to deal with everyday life.
...falling is not the problem, it's when you land...