Hi guys, OP here. Thanks for some of your funny comments, they made me laugh! To answer some questions, no, I do not sleep commando, yes I had pants on and no I wasn't robbed. I had a friend over, who stayed 'till pretty late (around 5 AM), so I was extremely exhausted. So exhausted that I fell asleep with my sweatpants still on, as I normally sleep without pants (so I was very lucky). I woke up about 30 minutes later, in the elevator. I had locked myself out, naturally, but luckily my friend lives in the same apartment building as me, and she had a spare key. I'm glad she opened the door when I rang her bell at 5:45 in the morning. I never had problems with sleepwalking before, and I haven't sleepwalked since. I hang my keys on the doorhandle every night, so that if I somehow manage to turn the lock and open the door, the keys will slide right off on top of my feet. That should wake me up if it ever happens again!