You use your time carefully when it's limited.

Given that theory, you may lose the sense about using your time wisely if you keep working day and night.

Once you give up your time, you start becoming less and less efficient.

Your performance will drop enormously.

That's when you feel that you're not good enough.

You will be more and more devoted to what you do until you become sick.

Is it worth ending up like this?

I don't think it is.