How to go back to sleep

Ok, I’m finally over the “go to sleep” phase in my life.

Now I’m struggling with staying asleep.
The first part got solved by going to establishing a routine and sticking to it: going to be around the same time, stop using electronics moments earlier, no caffeine, etc.

Now, my problem is, if for any reason I wake up 4-5 hrs. after I feel asleep, my body feels it has rested enough and can’t go back. The only thing that has been working - some times - is to avoid moving at all, and tell myself: “I’m sleeping, I’m sleeping, I’m sleeping”. It works most of the times, but if I have to move or start thinking about something else, then I’ll feel more awake and won’t be able to go back to sleep. Sigh.

Sometimes the movement is me trying to look at my watch for the time and see if I have had enough, sometimes it’s 4 am, which is good, sometimes is 10 pm which makes is easier to think I have to sleep more, but sometimes is 1:30 am, which puts me in 5.5 hrs of sleep, and then it becomes really hard to fall asleep again.

:/