When I was young and my brain was still in the process of development, everybody used to state the immortal rule that "You must get 8 hours sleep every night". Where this astounding piece of advice came from, I do not know, but as life went on I discovered that this mysterious potion for healthy survival was meaningless. Nobody turned into a frog if they got less than 8 hours sleep or developed huge dark bags under their eyes and their lifespan was no better than anybody elses.
The amount of sleep needed depends entirely on the individual. Some people need the magic 8 hours, others can survive healthily on 4-6 hours. Many of histories greatest names only had around 6 hours sleep every night or less.
I myself only need 6 hours of sleep and often less, with no adverse effects at all.
Perhaps the advocates of the magic 8 hours doctrine will consider that by encouraging an 8 hour induced coma, they are cutting out 30 years of life from a possible 90 years. One third of their life in a coma ! The day will come to every one of us when sleep will be infinite, so why limit ourselves to a maximum of 60 years active life when alive ?
Your own thoughts are of course welcome.