The number 17

Its happened to me on two occasions. I'm sound asleep at night and I hear the number 17 in my head, and asking me to open my eyes. I dont want to wake up as I find it really hard to go back to sleep, but I did on these two occasions and on one occasion the time was 4:17 and on another it was 6:17 or 7:17. I dont know what this is about. Why 17 and why does this voice keep saying it and asking me to make note?