I gave up alcohol as part of an experiment. Prior to that my routine on Fri and Sat night was usually to have a few drinks and zone out and watch youtube or a movie.

For me, one of the unexpected hard things was that zoning out to watch youtube or a movie was no longer entertaining! I could do it for an hour or so and that was it.

Now I read, work on projects or otherwise am more "engaged". I still enjoy youtube but my ability to be entertained by it has dwindled dramatically.