I believe that discovery was made decades ago, given the stories I&#x27;ve come across of people who fell asleep to &#x27;The Late Show&#x27; with Carson, back when that was the last broadcast of the day.<p>Ahh, here are two links which mention those days: <a href="http:&#x2F;&#x2F;www.salon.com&#x2F;2014&#x2F;02&#x2F;18&#x2F;how_jimmy_fallon_and_the_roots_brought_hip_hop_to_late_night&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.salon.com&#x2F;2014&#x2F;02&#x2F;18&#x2F;how_jimmy_fallon_and_the_roo...</a> and <a href="https:&#x2F;&#x2F;www.washingtonpost.com&#x2F;news&#x2F;arts-and-entertainment&#x2F;wp&#x2F;2015&#x2F;08&#x2F;12&#x2F;finally-nightly-johnny-carson-tonight-show-episodes-are-coming-to-tv-but-only-for-some-people&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.washingtonpost.com&#x2F;news&#x2F;arts-and-entertainment&#x2F;w...</a> .