People who went without sleep too long began to see things that weren't there.

Once he could have gone for three days without sleep.

Mother and daughter looked like they had spent too many days without sleep or proper food.

It was a very long night, spent mostly without sleep.

"I will try not to go three days without sleep again."

You have not had to go without sleep for days.

You should know that he can go without sleep for days at a time.

It was going to be another long night without sleep.

His face showed he had been without sleep for some time.

You've got to know how to go without sleep when necessary.