Weirdly it has improved already!
I’m the same, no problem falling asleep but waking multiple times in the night. I’d often just get up for a bit and then come back to bed and try again.
In the app there’s a bit with some recordings to listen to. I listened to one where they said to pick a random word ( “the”) and repeat that over and over in your head.
That’s working a treat. I still wake up but thinking “the … the” stops all the other thoughts coming in and I can roll over and go back to sleep! Witchcraft!