From what I’ve read on here and the response of my neuro, I reckon this is a pretty common problem - and a right pain
If I don’t get back to sleep after an hour or so, I get up & play some cards or have a browse on the internet, read a book, etc. and go back to bed later on. It normally works in that I usually get back to sleep, but if it goes on for more than one or two nights it’s a nightmare so I have sleeping pills to break the cycle.
Things I’ve found:
Looking at the clock makes things worse (“How long have I been awake now?!” “Oh for xxxxxx’s sake, that’s two hours, go to xxxxxxx sleep!”).
Worrying about it also doesn’t help. If you do wake up (normal brief wakenings) and you start to worry about getting back to sleep, it ain’t going to happen!
Don’t get up and go to the loo unless you REALLY need to.
Don’t toss and turn; get comfy and stay put.
Focus on breathing. Every breath out, try and relax into the bed - let the bed hold you up.
I bet others will have different tips - I hope you find what works for you soon. Insomnia is no fun!