He starts slightly as the figure suddenly throws his head back, but quickly composes himself as he recognizes Gamzee.

"I was looking for-- Wait! Were you asleep? I didn't think humans could sleep standing up. At least not instinctively. I know horses sleep this way about half the time, but it's a defence mechanism for them. Human's wouldn't have that particular instinct, being at the top of the food chain. Have you been training yourself to sleep upright?"