1)I get up early in the morning on weekends (relatively early like 7). I have sleep at a sane time on the night before to do this, instead of staying up and watching netflix till 3 in the morning on the night before.
Waking up at noon ruins the day for me. YMMV
2) Limiting the things you want to do. I had this nagging feeling that I should read all the interesting articles that come across in HN etc. I solved but installing a "save to wunderlist" chrome extension. I tell myself that I would read it later (which rarely happens).