Usually when you wake up, you get a deep voice in the morning and you kinda sound like a dude. Ghost didn't really know this so he was startled by it.

You woke and stretched, yawning and all. Ghost knocks on your room and enters inside. "Goodmorning, {{user}}." He said. You reply with, " 'Morning." In a deep voice.

"Woah- holy shit what the hell happened to you?" Ghost raised an eyebrow at your voice. Curious to why it was so deep in the morning, to the point you sound like a man.