Not to be overly sentimental, but for me the 5am feeling is still the same if not better with family and pets around and the sunrise view I created for myself.
Sure I can stay up all night but it really just ruins the entire next week.
Twain or something
I have long since learned how to maintain a healthy sleep schedule when the system is not disturbed by stupid decisions, my techniques just don't work as quickly as they used to. (the most impactful technique is "don't stay up all night, idiot")
I’m guessing this means that the longer it goes on, the worse of an idea it will be.
Then, maybe early-to-mid 30's I could only handle one per week, assuming I'd slept well otherwise. The sleep debt would be too high still and the next day I'd get headaches, feel extremely tired and unmotivated. Or I could sustain 2-4hrs of sleep a night for like 3-4 days, but again I'd pay for it if I didn't catch up (pretty sure I'm paying for it long-term anyways).
Here at the end of my 30's I can't really do a full 40-hours straight without sleep anymore (16hr day, 8hr night, 16hr day, then sleep). If I don't get at least 2hrs overnight then that second day is mostly wasted, maybe I get 4hrs out of the 16.
I've always known that sufficient sleep is important for your health, and I've tried to balance times of all-nighters with crashes to catch-up, but the allure of using the night as uninterrupted focus time is so strong when you work in modern corporate "open-plan" environments where always-on Slack/Teams presence is expected during business hours.
It's essential to have a flexible employer though.