I think he got two hours of sleep all night.

I don't think really well on two hours of sleep.

He works late but, I was told, needs only a few hours of sleep.

Start by getting at least eight hours of good sleep a night.

Do you get less than six hours of sleep a night?

I am not at my best after only three hours of sleep.

I would get two hours of sleep and keep moving.

Some people get along fine after 4 to 6 hours of sleep.

After two hours of sleep they were on the road by 0630.

No one has had more than a couple hours of sleep.