Kid came down with fever and had two naps yesterday. Went to bed late, woke up early, peed in his potty, vomited immediately after peeing, so thankfully it was in the bathroom and easy to clean up, sipped a little water, drank a lot of my milk, ate a few crackers, drank more of my milk, still had low-grade fever but was otherwise his usual self.
Obviously just reducing the experience gain isn't enough. It doesn't solve the core issue.