Sleep troubles

My son is 22 months old. His sleep has been pretty good but we’ve had some bad patches. So the other night he woke up at 2am and I couldn’t get him to sleep until 6am. The next night he slept 6:45pm until 7:05am so I was like oh ok it was just a random night. Well tonight he woke up at 3am it’s 5:30am and no signs we will be going back to bed 😫 is this normal I thought maybe it was teething but he usually goes back to sleep after some milk when teething in the past 🤷‍♀️