My brain was starting to show the lack of sleep.

People have lived after exposure of up to four minutes, which is when the brain starts to die.

But he added: "Once the eyes clear and the brain starts to work, you look around.

"We've got to get out of here," I said as my brain slowly started to process information again.

Fast, before my brain starts telling me what it's going to do.

You just clear your brains before the main course starts.

However, now that it was faced with a problem, her own brain started to function once more.

Then his brain started working again, and he wondered why he'd felt surprised.

He felt that his brain was starting to trick him.

Maybe I'd think about it later when my brain started to work again.