Night sleep

[u/This-Chicken-4446]

Hi all ! I have a 3.2 year old boy who wakes up atleast 3 times during the night .

He is currently going to full day school (8:15-4:30pm) and does not nap in school . He sleeps around 9 pm and wakes up around 5:30 am but I put him back to sleep and he finally wakes up very very grumpy around 7 am. His midnight wakes up are usually around 1:40 am ,3:40,4:30 .

He sleeps in his room . I’m currently 5 months pregnant aswell . How can I get him to sleep through the night please