The sentences that use the word "restless" correctly are:
- He asked them to turn down their restless music since he was trying to take a nap.
- With the bright full moon and the chirping crickets, he had a restless night in the tent.
- She had a restless curiosity that jumped from one subject to the next.
The sentence "His essay got a low grade because his evidence was restless" uses "restless" incorrectly, as evidence cannot be described as restless.