He woke up due to the sun shining in his eyes. It was still low on the horizon, and it was at just the right angle to shine on him in the gap between two trees.
He wondered why he was in such a position to see the rising sun, before remembering that he had agreed to a weekend in the great outdoors, camping with friends.
He was in a sleeping bag, next to his rucksack, and the tents of his friends were scattered around the campsite.
He knew why he could see the sun. Someone had stolen his tent!