Sleep deprivation is something common only among writers who work for academic writing companies.
Actually, sleep deprivation is epidemic throughout American life and it's been formally identified as a cause of myriad illnesses and it is responsible for even more traffic accidents than alcohol. I haven't written a project for an essay company since 2013 but I'm sleep-deprived right now and about to go to bed at 9:00 AM because I had 2 deadlines yesterday, a weight workout after that, a hockey game at 9:30, and another deadline that I just completed. I'll have made up all of that lost sleep by Sunday or Monday. It's an easy enough topic to research and a very quick Google search yields some of the numbers right here:
cdc.gov/sleep/data_statistics.html
I heard that we never recover from lost sleep.
Negative. Be very skeptical about anything you just "hear" because most of it isn't true. For example, it isn't true that we use only 10% of our brains or that Albert Einstein suggested that the complexity of the human eye provides evidence of a "god" who designed us. We use all of our brains and Einstein was an atheist who absolutely rejected ANY notion of a conscious "god" that created human beings to be any more "special" than other animals and whose only concept of any "god" was the mystery, eternity, mathematical symmetry, and beauty of the universe; and I "hear" both of those beliefs all of the time from people who sincerely believe them because they've "heard" them. We always recover lost sleep, eventually; it's a homeostatic process. As soon as whatever causes that interfered with your getting as much sleep as you needed in a given time period are removed, you will automatically begin catching up and you will quickly make up whatever "sleep debt" you accumulated. A very quick search yields the following articles about sleep-deprivation debt and making it up.
health.harvard.edu/womens-health/repaying-your-sleep-debt
scientificamerican.com/article/fact-or-fiction-can-you-catch-up-on-sleep/