Snooze n ring!

Last night, I couldn't sleep. Its different when you actually dont want to sleep or cannot sleep as opposed to "couldn't sleep. Its even difficult for someone, who the moment hits the sack departs to dreamland! I fall asleep almost instantaneously. So I was actually getting frustrated. I logged on the messenger. Did not find anyone to talk to. In fact the moment I switched on my computer I felt the urge of going back to my bed. Kept turning and it was almost 3:00 AM. I have three alarms set on my cell phone. One that goes on at 6:45 AM, one at 7:00 AM and the other one at 7:15 AM which I snooze and finally wake up at 7:30. I keep my cell phone towards my right hand side and I am used to having it over there! Last night, I happened to keep the cell phone on the floor and I failed to listen to a SINGLE alarm. I did not hear a single ring and which resulted in my waking up at 9:15 AM. Even then, I only got up listening to my sister's call. Ironically, the ring tone of my alarm and that of a phone call are the SAME. Even then, I have yet to figure out, what makes me lift the phone even when I am in Stage 3 and State 4 sleep (which is considered to be the deepest stage of sleep cycle for a human being) and completely ignore the alarm. How does my mind differentiate between a ringing phone and an alarm! Maybe coz I changed the location of the phone and maybe we are so used to associating a thing to the place where it belongs!!