Night screaming deserves a quiet night

Oliver has been waking up in the middle of the night screaming. It wouldn't necessarily be so bad, but it also wakes my wife and I up too. And if we could divine what it was that was waking him up, we could fix it. But he wakes up calling for water and refuses his water cup. He wakes up for blankets and refuses the blanket we give him. And those are the times when we can decipher his requests. I keep hoping that this is a phase that will end in about a day and a half. But so far no luck.