The recollection of how the Doctor slept jogged his memory. It brought back another hidden beneath the surface. A time when the Doctor ran out of energy and stopped. And oh could he just stop thinking about those things please? Even when he didn't mean to, they only complicated his mind.

"Yeah well just be careful," he said with an attempt to sound slightly chiding.

He took tight hold of his hand and helped the Doctor up.

"It's only been a few hours," he told him, "I don't sleep much myself. Especially not now." He paused though and frowned slightly as he looked at the Doctor.

"You okay, you look kinda pale."