9 hours of sleep

Is

My son has always been a pretty good sleeper getting around 12-13 hours of sleep. Except for newborn time obv and the 6 month sleep regression time. But then he went right back to normal. I put my son to bed at 9:00pm and he wakes up at 9:00am but lately for the past 4 nights he has been waking at around 6:00am. Anyone else going through the same thing?