Why do cicadas stay up all night chirping irregularly, unable to sleep?

Their cicadan rhythm is off

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Sleep Jokes More Sleep Jokes

What does a man often wake with, but can never go to sleep with?

An alarm, you pervert!

What does a cat sleep on?

A caterpillow.

Stay Jokes More Stay Jokes

What do you call a fruit that stays up very late to study for tests?

A cramberry.

What have you been doing" asked Jane. "Chasing a herd of elephants on vines" "Really?

Said Jane. "I thought elephants stayed on the ground!"

Night Jokes More Night Jokes

What do you get when you cross a dyslexic, an insomniac, and an agnostic?

Someone who lays awake at night wondering if there is a dog.

What does Bill Cosby do when he can't sleep at night?

He finishes her drink EDIT: Apparently this is Conan's joke, so all credit goes to him. I just heard it from a friend of mine and I had no idea.