When the knights had fallen asleep, the sun was just waking up. The black sky turned dark purple and, at some point in their slumber, the sun had risen and greeted the Earth with warmth.
Ever since joining the knighthood, Henry woke up religiously with the sun unless he had done something like night duty which always messed up his sleeping for a few days.
Despite the interruption during the night, it seemed his body still had the cruel desire to wake up with the sun. He could have used a few more hours of sleep but it was useless as he heard the commander already having started his day.
He woke up feeling the same sense of shame that he felt a couple of hours prior when he was coming out of the trance-like state of the lady in white. It was still hard for him to comprehend that it hadn't all been a dream.