That Monday Morning Exhaustion Has A Name: Social Jet Lag

"We saw people leading different lives on weekends and workdays," he says on a call with mbg. On weekends, many people slept at times that differed greatly from those during the workweek, as if “they were flying from Europe to the States on Friday evening and flying back to Europe from the States on Monday morning. That's where the term 'social jet lag' came from."

You might be thinking, why does it matter if you go to bed later (and wake up later) on weekends—as long as you're still getting the same amount of sleep? Roenneberg has found that even if people clock their eight hours of on the weekends, social jet lag still has potential health consequences because of the way it puts them out of sync with their circadian rhythms.

These biological clocks dictate the time window when each one of us naturally wants to spend asleep and awake. Someone with an early rhythm—or chronotype—is known as an early bird or lark, while someone with a late chronotype is more of a night owl. Where we fall on this spectrum is the result of our genetics, age (most people have the latest chronotype during adolescence, and it gradually gets earlier from there), and light conditions, Roenneberg explains.

When we travel across time zones, those lighting conditions change dramatically, and our clocks need a few days to catch up. "But unlike travel jet lag, social jet lag doesn't stop," Roenneberg says. "It's chronic."

You can think of social jet lag as the gap between when our bodies naturally want to sleep and when our social schedules allow us to sleep. If you're someone who needs to set an alarm every morning of the workweek and are exhausted come Fridays, you already know what this gap feels like. You're constantly awake during times when your body wants you to be asleep—and have the caffeine dependency to prove it. Switching your sleep schedule on the weekends will only confuse your circadian rhythm more, making it harder to return to your alarm clock on Monday morning.

Roenneberg explains that the later your chronotype, the more likely you are to suffer from social jet lag since many workplaces and schools start early in the morning, and we are generally told that it's important to wake up early to get a head start on the day. "The later you are, the more likely it is that the social times are forcing you to live against your body clock," he says.

Ultimately, the only way to "cure" social jet lag is to ditch your alarm clock, sleep when you're tired, wake up when you're rested, and keep up with the same sleep schedule day after day, even on weekends. For most of us, it's just not feasible.

Your rhythm appreciates consistency, so skipping the occasional late night will help you fall asleep easier and wake up more refreshed. Instead of shifting your sleep schedule by three hours on Fridays and Saturdays, for example, Shelby Harris, PsyD, DBSM, author of The Women's Guide to Overcoming Insomnia, recommends keeping it to 1.5 hours.

While it's not possible to change your chronotype to avoid social jet lag altogether, Wittman says that good sleep hygiene can help you adapt to it a little better.

To account for all the different chronotypes out there, Roenneberg says he always encourages employers and schools to allow employees and students to set their own hours that sync up with their natural sleep-wake cycle. Not only can this improve productivity and work ethic, but it will reduce the amount of sleep catch-up we need to do on the weekends.