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

I think he got two hours of sleep all night.

I had only four hours of sleep during the last two days.

They hope to get six hours of sleep each night.

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

And she could get by with five or six hours of sleep each night.

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

Most people need between seven and eight hours of sleep a day.

I know you haven't had a lot of sleep recently.

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