Every single day is a unique and precious moment in time; spending that day sleep deprived has many disadvantages from a human's perspective. You might have cau

Every single day is a unique and precious moment in time; spending that day sleep deprived has many disadvantages from a human's perspective. You might have caught a cold you otherwise wouldn't have, or been slightly less emotionally stable during an argument with loved ones and been overly harsh, or any other number of things where if you'd been well-rested, you would have been Better. Oversleeping the next night and undoing causal effects of that short sleep day can never be reversed, both external and internal to the body. The benefits and effects of sleep are many and I highly recommend reading his book, after which you too will probably agree, you can truly never get it all back, not even close. One fine example that blew my mind was that getting your flu vaccination the same day as getting short sleep will effectively short circuit your immune system's ability to integrate the vaccination, making it much less effective that you're vaccinated for that strain(s)! His book represents to me a paradigm shift in understanding of what sleep even is. We sleep so that we may live, not the other way around.