There's no need to worry. As of right now, he's not showing any exhaustion. Of course, that might also be a slight mental disconnect. Things like 'pain', 'hunger', and 'exhaustion' are sort of vague concepts more than things that actually happen to him anymore. At her question, he gives a tentative nod of his head before the words form.

th3y l33ch 0ff p21. gr0w 1nt0 2k1n.