Days, which consisted out of a constant cycle of eating, exercising, and sleeping, passed by slowly for the pitiful Mark. Within the many days, Mark had to eat roasted wild meat without seasoning, he had to train for almost an entire day, and had to sleep together with Artemis. Sleeping is supposed to be the best part of his routine, since it's basically the time where he can finally rest, and where he finds himself lying right beside a beauty. Unfortunately however, it wasn't the best part for him, because he couldn't really rest well with the thought of having to keep every part of his body away from Artemis so he can remain alive.
As a result of all the cruel days that Mark has to go through, Mark had a sleeping disorder, an exhausted body, and a bitter tongue. In conclusion, he was completely wasted, mind and spirit. That's why, in the end, which is on the sixteenth day of his continuous routine, Mark passed out under the heat of the sun.