It takes a long time to fall asleep when I go to bed, and I'm so bored I can't stop browsing social media, it always ends up with 2~5 hours!
Recently I bought a Kitchen Safe (time locking container) to force me to stop using my phone. And it works! I can't do anything other than sleep. Still, it takes a lot of time to fall asleep, but if I continue this, I believe I can become a good sleeper! (It helps to reduce phone time in general, I recommend it to anyone.)