During my university years I went through a phase of being a religious extremist, where I interpreted some Islamic teachings in ways that weren't healthy for me or helpful to those around me. One such teaching was to use time wisely, which I took to the extreme of trying to sleep as little as possible.
I felt guilty whenever I slept (event if I desperately needed it), which meant I wasn't operating at my best and ended up sleeping in the most inconvenient of places (during university class rooms or while having conversations with family members. Yes, really). My brother used to joke that he would have bets with himself before entering our flat of where I'd be sleeping when he walked in (in the living room, on the computer, while eating).
The desire to sleep less (and be more productive) lingered on for a few more years, but in less extreme expressions. Recently, I decided to prioritize sleeping 8 hours over waking up early. It remains a struggle to get quality sleep, but I no longer feel guilty about it. In fact, I see it as a goal to pursue.
And I've noticed that sleep has helped me come up with better ideas for my businesses and writings, and I often think through problems and structure my thinking while sleeping. It's rejuvenating, enjoyable, and rewarding.
Sleep is one of the most productive things you can do, and if you've been resisting sleep because you want more hours in your day, then I suggest prioritizing the quality of those hours, which can be drastically improved with sleep. And don't see the hours you sleep as "time off", but as a different mode of productivity, where your brain is cleansing itself of toxins, consolidating your memories, integrating new learnings, and doing lots of work without your direct supervision.
Sweet dreams, and stay productive!