I woke up from my sleep several times last night. Mostly woke up, checked the time, went back to sleep. At 3am I clearly felt someone tap me in the shoulder from behind me (in my bed), and told me to thank my friend for waking me up. I wasn't sure who could have entered my room in the first place, but I turned around and no one was there... It wasn't really scary, but still kinda creepy.