Please read this article for more details.
中小企業だからこそ考えるべき睡眠負債の問題１～概論編（First problem of sleep debt needed to be considered especially by small business-Introduction)
Author: Shigeki Yanai (small business analyst)
In short, the book mentioned that: you will be sleepy at work if you don't get enough sleep, and productivity will decrease, so you should get enough sleep (maybe more complicated than that).
In any case, I think:
"good performance" = "sleep" + "exercise" + "diet"!
Above is translation of an article "睡眠負債とは？" dated December 19, 2017
Translation by Hiroko Matsuda