Mine does as well. I don't have a computer desk, I have a table set up next to my bed for my iMac cause I use it as a TV, and with my cable modem, wireless router, NAS, external HD, speakers and subwoofer, it leaves no room for my MacBook so it usually stays at the foot of my bed, I've got a wide bed though. My keyboard and wireless mighty mouse also stay on the bed. I don't usually have a problem with rolling over on any of them, but one time while I was working graveyard my wife had the iMac on windows XP and rolled over onto the mouse and managed to get some kind of virus or malware on it. How sad is that? Luckily it doesn't take long to restore XP since all I use it for is to play GuildWars, she used to use XP all the time (for surfing the web and GW as well) but since then is much more fond of OS X.