why are humans so helpless when they sleep?
Because they can't move, and if they do, that would be being somnambulist(sleepwalker), they have erratic movement so they can't do tasks efficiently because they don't have their five senses activated:

1-. Sight.

2-. Smell.

3-. Earing.

4-. Taste.

5-. Touch.
The answer seems legit.
Thanks, always glad to serve you
Can you write me a story of two men having consented sex