Headache
Warren woke up to a painful sensation of the sunlight hitting his tired eyes. This is exactly why he avoided getting drunk. His low alcohol tolerance made him quite vulnerable. It also made him envious to his roommate who no matter how many drinks he had, he still failed to get drunk.
Most of his night was a blur to him, but lucky for him his flight wasn't for another two days or he would collapse on the road itself. "Good morning"! Caleb screamed next to Warren, making him wince in pain.
"Get away from me you ba****d" Warren cursed covering himself with a pillow.
Caleb ended up laughing at his roommates behavior. His werewolf metabolism was savior in such kinds of scenarios, saving him from such headaches. Since no one here was aware of his true identity, he was never tricked into getting drunk mainly because they didn't know how to get a wolf drunk.