3 year old changes

For about 2 weeks, my son has been fighting bed time. Trying to extend bedtime. Also waking up earlier. Out of the blue. No changes in routine or household. Is it a normal phase?

What would you suggest?

-Leave it alone as it will probably go away or it just is the way it is, nothing can be done.

-Earlier bedtime? Currently sleeps 8pm until about 7:30/8am. But lately been waking at 6:30am. No naps for 1.5 years.

-something else

Any advice please.