This happened just recently...
I decided to stay up late one night because I had to transfer some video and music files into my friend's USB flash drive. It was right about 2:39 in the morning and I was getting really drowsy, so I thought of just sleeping for a few minutes. I set my alarm for exactly about 2:45 am.
I didn't want to wake up exactly 3am because I somewhat believe that 3am is the witching hour. Back to my story. I set my alarm for 2:45am. Take note, I wasn't alone in the room. My brother and I sleep in a bunk bed and he was already asleep since 10pm and I sleep in the top bunk. So, I went up and the moment I laid down, I slowly fell asleep.
Suddenly, something cold held my hand and I woke up at that instant. I noticed that I fully covered myself with my blanket and I just knew there couldn't have been a draft. I wasn't actually afraid but since I'm awake now, I just thought I could go back to what I was doing. I looked at my clock and it read 2:43am, I was relieved because it wasn't 3am yet so I continued the file transfer. I reset my clock for 2:55am again because there was still a lot to transfer and I thought of sleeping for just a few minutes again before resuming.
At about 2:50am, I was feeling sleepy again and went up my top bunk and lay down and slowly fell asleep and all of a sudden, something cold touched my right foot, I awoke and looked under my blanket. I was sure this time that a draft couldn't have passed by because I tucked myself in quite tight.
After that, I left the computer on, hid under my blanket and waited until morning came.