Once you figure out that doing the things that you love can repay you plentifully, you forget about the concept of being tired.
Your mind gets a huge dopamine rush whenever it is at ease knowing that doing what you love also pays your bills and supports your needs.
You can continue doing what you love tirelessly, day in and day out, until one day you start to notice abnormalities in your routine.
Take Nene for example: She mentions on stream, laughingly, that she could not sleep for more than 1 hour a day for the past 1 week. Nene being the highly energetic and loving person, her emotions were a barrier to her conscienceness, which was screaming for a break.
Korone, on the other hand, might fool us that she has "trained her body" to stream for extremely long hours without any consequences. She's infamous for her 24-hour streams afterall. Dopamine is an incredible thing, it can render basic body functions if the mind is overdosed on it. Hence what happened to Korone - she got diagnosed with severe levels of stress, which was felt by the body and not her mind.
It reminds me of those people that have a disability to not feel pain. Because of that they don't feel pain, often do they hurt themselves badly, and very often, deathly.
That is why routine must be enforced by managers. One of their fucking jobs is to take care of our oshi's health afterall. Nene and Korone might not notice this but they basically shit-talked their managers big time, which should serve as a very late wake-up call.
OP wasn't a faggot today. Fuck tardy management in every job and activity.