Hello @sleepless1, Welcome to Connect. I know it can be a struggle sleeping after a hip replacement or any major surgery if you are still having pain but it sounds like your recovery has been OK other than not being able to get back to sleeping normally. I had some trouble sleeping early on after my knee replacement but it was more due to not being comfortable as I also didn't have much pain after my TKR. You mentioned you have done a lot of searching and have not found anything that has helped. @sueinmn, @artscaping and others who have had hip replacements may have some thoughts or suggestions to share with you.

Here is some information from 2017 I found that talks about the topic but I'm not sure how helpful it is.
-- Improve postoperative sleep: what can we do?: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5768217/

Another search engine I use when looking for the latest medical research information is Google Scholar. It has some easy to use sorting of search results by year -- https://scholar.google.com/

Has your doctor or surgeon offered any suggestions to help with the insomnia?