I have a huge problem with them. Usually I've got 5-6 alarms set one after another to wake me up properly. Even if I put the clock/phone far away, I'm quite capable of getting up, going there, turning it off (code or whatever protection is not enough to stop me), going back to bed and not remembering any of it. And no, I'm not sleepwalking really. I'm just not awake enough to do a mental switch between "there's this thing that's annoying me, I must stop it to continue sleeping" to "it's morning, this annoying thing is trying to wake me up".

On a typical day my alarm wakes up my girlfriend and she pokes me until I wake up. Actually, I just switched to an Android phone, so I'm going to try some of those movement detection apps... we'll see how good they are.