There are levels to that: 1) don’t need to sleep, be able to sleep: the coolest thing in the universe. 2) don’t need to sleep, be unable to sleep: you would l

There are levels to that: 1) don’t need to sleep, be able to sleep: the coolest thing in the universe. 2) don’t need to sleep, be unable to sleep: you would likely cope. Also, be an irreplaceable shift worker. 3) need to sleep, be able to sleep: this is where most of us are now, nothing to write home about. 4) need to sleep, be unable to sleep: the rest of your life is short and full of exponentially growing suffering. By „don’t need to sleep” I mean that the body refreshes itself by different means and you still reap the benefits. I can’t really imagine how it would feel, much like I can’t imagine being immortal. Most fiction describing those phenomena as „nightmare” usually is about a character who gains the ability but none of the protective mechanisms.