I always try to get 8 hours a night no exceptions. I gave up caffeine 2 years ago and really haven't needed it. Many of my colleagues get about 6 hours a night

I always try to get 8 hours a night no exceptions. I gave up caffeine 2 years ago and really haven't needed it. Many of my colleagues get about 6 hours a night and tell me they feel like shit. That said, my PI is one of the rare people who only needs 3-4 hours a night and the guy has published over 500 papers and has read nearly everything published in or tangentially related to neuroscience. On average he probably gets and extra day of productive time a week which is a huge advantage.