A Hatfield Township man was assaulted in his home early Thursday morning.   Investigators say the Maple Avenue resident required hospital treatment after he interupted a burglary in progress.   The victim told police he was sleeping when woken by a loud noise.   He opened his bedroom door and was blinded by a flashlight.   At that point, the burglar assaulted him.   The robber got away with a camaera, a television and two computers.   The victim was treated for his injuries at Abington Memorial Hospital.   Police hope to release a discription of the burglar soon.