dream meanings

I'm a late sleeper. Soon after retiring to bed 3.30am I dreamt someone was trying to put a key through the keyhole. I remember saying to myself, who would be trying to get in at this time in the morning knowing that my door is always locked. In the dream I looked at the clock and it showed 4am. I did not stir but lay there in my dream satisfied that I did not get up to investigate.I had no idea who it could have been but I was not worried.