Under normal conditions, the rhythms governed by the SCN are synchronize, but when people travel by air across several time zones, they tend to feel out of sync. Explain what psychologists have discovered about being out of sync.

Your response should be at least 200 words in length. You are required to use at least your textbook as source material for your response. All sources used, including the textbook, must be referenced; paraphrased and quoted material must have accompanying citations.