Keith licked his lips after gulping down the whole butter beer in a swig, "This tasted extra yummy," He said, placing his feet on the table and yawned, "But I feel funny.....weird and I migh..." He couldn't finish and abruptly fell asleep!

Maybe this was the aftermath of the potion in the butter beer. Everyone's body deal with certain things differently and in Keith's case, he drifted off to sleep.