[Version467]

Good sleep hygiene really is a prerequisite for this stuff.

I would recommend removing the phone from the bedroom entirely. If you want to use your phones alarm clock, make sure that no other notifications can come through during your scheduled sleep time and put it on the other side of the room (this also forces you to stand up in the morning because you can't turn off your alarm otherwise).

You say 'no books either', and I agree with it, a bedtime routine works best if the bed is only used for sleeping, but I had great success with first replacing my phone with my ereader and allowing myself to read as much as I want. And then later on I removed the ereader. That was much easier than just removing the phone at once.