'It really must be the heat. Or those thoughts. Those confusing thoughts and conflicting feelings running through his head as soon as it hit the pillow.' No matter how tired he was, sleep wasn't merciful enough to rob him of them. He desperately tried to focus on clearing his head and will himself to sleep. The list of tomorrow's chores flashed through his mind, reminding him that he needed to be fresh in the morning to be on time, and not fall asleep while…say, mucking out the stables. A replay of that particular scene would be beyond embarrasing.
He failed.