Where has my great little sleeper gone?!

[LB80]

My 2 year old has always been a great sleeper. Settles off to sleep and sleeps all night.
In the last few weeks he is up and down from the minute he gets into bed at 7pm and some nights not falling off to sleep until 9pm!
He keeps coming out his room, saying he needs a wee, pulling books off his bookshelf just generally anything to not be in bed.
Im running out of ideas on how to break this "phase"!
Any suggestions would be great

X

Does he still have an afternoon nap? If so, you may want to think about dropping it or cutting it short. If my DD had as little as 20 mins sleep in the car or something at a similar age then she didn't go to sleep till late.