Why do I always get sick on holiday?

Change is hard

Taking ourselves outside of our normal routine can be stressful, according to Howard Tinsley, PhD, professor emeritus of psychology at Southern Illinois University. “All of those things that fit into our daily routine are disrupted when we’re on vacation,” said Tinsley, who specializes in the effects of leisure behavior. “We may sleep in, we may get up earlier, we may eat differently, we may do different things that create stresses that we are not equipped to handle.”