Something really odd and interesting happened yesterday afternoon while I was taking a nap. I was in the middle of a dream that involved my dad and we were at some vacation house somewhere in the woods.

My room is right about the garage, so whenever the garage opens I usually hear it. Well, I can remember clearly hearing the garage door open but I was still in the dream. I then remember my dad talking to me in my dream, and the dream was going on but at the same time I knew my dad was coming up the stairs and opening my door to look in on me, and by the time he was at my door I knew he was there. I awoke about 2 seconds before he opened my door.

I am usually a pretty heavy sleeper and things like a garage door opening will not wake me up. Are we somehow more prone to waking if we take a nap later in the day compared to the sleep we have at night?