on a piece of paper (it’s not so practical to do this part in your imagination so actually write your reminder on a piece of paper) and add it into the box of worries.
it too shall be waiting for you in the morning, i promise.
of course, there can be other reasons for broken sleep, like if you have a young child. that’s a different problem with a different solution.
put those worries in a box and get the rest you need. 