The correct answer is true.
It is true that going without sleep is actively harmful to every creature that needs sleep.
Every single live creature on the planet needs sleep. In the case of humans, it is a necessity. When you go to sleep, your entire body rest. And you need a good rest in order to correctly function every day. During sleep, let's say "you recharge batteries." Without proper sleep, you feel dizzy during the day, without energy.
