Hi all. I'm not sure if this helps everyone, but I've had issues sleeping for many years. I've recently started listening to these sounds on YouTube. Now, I wouldn't say they cure my problem, but they've been surprisingly helpful. It's the dark-screen videos I like (I can't sleep if there's light coming off my TV).
It's weird, but the ones I really like in particular are vacuum sound like this one:
https://youtu.be/QzANUwjPlXA
Sometimes nature sounds too, but it's really the odd ones that relax my mind.