It’s all perception. Eat well. Drink water. Believe in yourself.

I have a friend that will literally go a whole week without sleeping (which I personally do not have the mental fortitude for).

There are plenty of people that will do a two hour meditation and not sleep but be fully functional.

The fact of the matter is that you have followed a set schedule of sleep/wake with the rising and setting of the sun. These people have broken that cycle. Not saying that it is easy, but it is all in your head.