If you wake up super early no matter when you fell asleep, you could have Circadian Rhythm Disorder.
Do you ever need to wake up for something early in the morning and find yourself naturally rising just a minute or so before your alarm goes off? That is because our body has an internal clock. That's also why we get in the habit of waking up around the same time every day. However, it can become a drag when we start to wake up super early, regardless of whether our bedtime is 8pm or 3am. This can be a sign of a Circadian rhythm sleep disorder.
Circadian rhythm sleep disorders come in different forms, but many can cause you to wake up early every day, regardless of whether you want to or not. To treat these, you should maintain regular sleep-wake times, refrain from napping, make sure you are exercising every day, and do not indulge in any type of stimulants within 4 hours of going to sleep.