Autist passing through here. I can rarely nap without messing up my night sleep. I like to do a little "NSDR (non-sleep deep rest)"* relaxation exercise though (I actually use the same one when I go to sleep, too). I find it helps since it gives me something to focus my attention on. Just thought I'd mention it in case it's useful.

* I still use this one from when Andrew Huberman had credibility. Annoying intro/outro, but pretty good otherwise.