It's all about having trouble falling asleep that may be due to anxiety and/or noise distractions.
For those having poor sleep efficiency, as it is called, I find some background noise makes it easier to ignore all else and fall asleep faster. I hate to get addicted to that but for the meantime it beats spending an hour before the sand man arrives. I've found a web site that offers free colored sound, yes you can get white, pink and brown, and it will run as long as you like for free.
Google freewhitenoise dot com and take a listen. Click the "Simply Noise" button and choose your color.
I like the white version best but YMMV so take a listen to all of them.
If you don't want to keep the puter on all night, you can remove the antenna connector from your TV and get some good white noise and even have the remote control to adjust it. You could also buy a noise machine from Walmart or elsewhere for around $20 that will do the job. I'm planning on testing one from there to see if it does the job, can always return it. I sure don't want something with a detectable repeating loop type of system. Plain old white noise without any change is best, at least for me. YMMV Those rainforest sounds and ocean waves just make me lie there and listen for the start of each loop. Not a good thing...