There's just no sense in forcing anyone who requires sleep to miss it.

"The old require very little sleep," she said, with a deprecatory shrug.

I require less sleep, and my mind is clearer.

"I could not relate because I require too much sleep," he said the other day.

They require long sleep and often have a dream with story.

And suddenly it crossed his mind that though he would some time require sleep, the Un-man might not.

As he had told her, even severe damage did not cause him to require sleep.

As they get older they should require less sleep during the day and more at night.

Perhaps if my body wasn't so damned big it would require less sleep.

Presumably, Monrak does not require food, water, air, sleep or possibly rest of any kind.