Night of the Living Mummy (House of Shivers #3) - R L Stine - Bog

"Happy Silverman is more than a little excited for his class trip to the museum. He loves learning about ancient Egypt and can't wait to see real mummies. At the museum, Happy leans as close to the mummy display as he possibly can--and something strange happens. His head spins and he hears an unfamiliar voice ringing inside his mind. The mummy is inside Happy's brain and need his help--or else"--