The Doctor looked at Jack "I'm really tired and been in the SUV made me nearly fall asleep, you two can go have fun," He wasn't sure he could stay awake if he tried to go on the Ferris wheel. He lay back closing his eyes and fell asleep.
He looked really worn out, he had been so busy lately that he hadn't got a lot of sleep , and he also hadn't had much fun. He was too tired to stay awake and he breathed deeply.