Seriously how do you do the former. It seems damn near impossible to balance work, personal development for my career in the future, social life and health while still getting recommended amounts of sleep?
First step is to track your sleep with an Oura or Fitbit or other device. These devices are not going to be as accurate as an EEG used in a sleep study, and they are good enough, even if they usually cannot tell the difference between fiddling with your phone in bed and light sleep. Maybe you can survive on less sleep. But the first step is to figure out your baseline.
Abandon ballast. Usually entertainment can go first. No more TV shows. Minimize to the weekly movie and listen to audio books on the commute.