Its weird how after a while though your body/brain kind of gets used to being woken up lots. I have trained myself to not wake fully otherwise I cantget back to sleep. My autistic son sometimes sleeps fine for weeks and then for about 3-4 weeks is awake for like two or three hours in the night shrieking/laughing/running/jumping and rattling doors and if we are really blessed smears s*** all over his bedroom, he is nearly 5!
Amazingly our 2 year old daughter sleeps through it all so we have one happy and content child.
It will improve, might not feel like it, just wait untill they can start calling your name at 5.30 am and demand weetabix and cbeebies.