Trading sleep for extra productivity is a losing game in the long run. It’s much better to swap out some time waster activities like watching TV or, yes, browsing HN. It can be tough to reduce time spent on vices, but after the habit is established it’s much more satisfying to do something productive with that time.
I found it helps to streamline other parts of my life to recoup free time. Simple things like meal planning, using flex schedules to commute during low-traffic hours, working out at home instead of the gym, and doing grocery shopping in bulk only once per week have been great ways for me to recapture 30-60 minutes every day.