@Blort
My best working strategy is not to don't do things that withhold me but do other things intentionally.
If you desparately want to surf late at night nothing will really stop you (or your brain).

So start earlier and do some stuff instead that will calm you down and is somehow limiting but also cool enough to switch from your high dopamine surfing.
Maybe reading a book while drinking a tea and dimmed lights will do that for you. Or playing a relaxing game with time limitations.