Till Roenneberg, a professor at Ludwig-Maximilians University in Munich, who is an expert on sleep cycles, coined the term “social jetlag” to explain the discrepancy between what our body clocks need and what our social clocks demand. Of course, plain old jet lag can also play havoc with our body clocks—so, as someone who travels a lot across multiple time zones, I am ruthless in enforcing my anti-jetlag rules. While airborne, I drink as much water as possible, strictly avoid sugar and alcohol, move around the plane as much as space and security restrictions will allow, and, above all, sleep
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