I’ve heard this so many times in my life. Unfortunately I’ve found it not to be true, at least for me. I served in the United States Navy on Submarines and our life didn’t operate like that but we had some of the sharpest people I’ve ever known onboard. I normally get about 4–5 hours and my life have been that way for more than 2 decades.
I feel that I am highly productive and have lived a good life and God willing will live an even longer life. I am not depressed nor do I have … googled. :)