3 and 1 year sons don’t sleep !!!

Crystal

I need help ! Both my sons don’t want to fall asleep. They stay up all night!

I usually put them to bed around 9-10pm

But they wake up around 12am and won’t go to bed until 4-5am ! And they usually wake up around 1-2pm 😭

What can I do to make sure they sleep throughout the whole night ?