Sleep? He's not great at napping. Read: he never naps, it's too hard to relax enough for it and when he does sleep it's lightly in the first place. During the day there's just more going on that could startle him awake after too short a time, which makes him feel worse. But sick people need rest, he acknowledges. He should get as much as he can now, before being too stuffed up to breathe properly starts keeping him awake.

"Hm... I'll try."