The tingling gave by the sunlight touching his face told Desmond that it was time to get up, surprisingly Desmond did not seem tired at all from all the exercise he did the night before and on the contrary, he seemed extremely energetic; With all the stress out of his body and having fulfilled one of his deepest desires, Desmond was ready to start the day.
Claire on the other hand was the opposite, the poor girl had an exhausted smile of satisfaction on her face as she snuggled like a kitten on Desmond's chest, as for waking up from her? Claire would probably spend the day in bed if someone allowed it.
Seeing the beauty resting on his chest made Desmond smile from the bottom of his heart, no more a playful sadistic smile that he had sometimes but a smile of true and pure happiness.
But it would not be the same if he decided to spend the whole day in bed so Desmond with all the pain in the world had to get up very careful to not wake up Claire.