Jet Lag Without the Jet

Or the Monday Hangover You Didn’t Drink For

With the clocks changing around me (in Singapore we don't change clocks twice a year) I learned about a new thing and I wanted to share it.

It’s called social jet lag, and the thing that struck me is that most of us are living with it without ever naming it.

Jet lag is seen as something that happens when we cross time zones, stepping off a plane and feeling out of sync with the day around us. Social jet lag is more subtle than that. There are no passports or long-haul flights involved. It happens when our internal clock, the one that governs when we feel alert, sleepy, hungry, or focused, falls out of alignment with the schedule we are trying to live.

During the working week, many of us wake up earlier than our bodies would naturally choose. We go to bed at a reasonable time, or at least we intend to, and we move through structured days shaped by meetings and routines. Then the weekend arrives and something shifts.

Bedtime drifts later. Mornings stretch out. The alarm is silenced. Unintentionally we have moved ourselves into a different time zone, and by the time Monday comes around, we are not just returning to work. We are, in a small but meaningful way, travelling back again.

The term itself was popularized by the chronobiologist (great title huh?) Till Roenneberg, who described it as the gap between our biological sleep timing and the sleep timing imposed by our social lives.

A simple way to picture it is to imagine the midpoint of your sleep on a workday compared to a free day. If those two points sit far apart, your body is constantly being asked to adjust.

What makes this interesting is that it doesn’t always feel dramatic. You might not wake up and think, “I am jet lagged.” Instead, it shows up in other ways. Monday feels heavier than it should. Focus takes longer to arrive. Energy is inconsistent. There is a sense of needing to catch up with yourself before you can really begin.

Over time, the effects are not just about feeling a bit off. Research in sleep science and chronobiology has linked social jet lag to changes in mood, reduced cognitive performance, and even metabolic effects. When the body’s rhythms are repeatedly disrupted, it doesn’t quite settle into a steady state. It keeps adjusting, recalibrating, and never fully settling.

Our days are shaped by shared schedules that rarely take individual biology into account. Some of us are naturally earlier, some later, and most of us sit somewhere in between. Add to that the influence of artificial light, screens, late dinners, and the general hum of activity that stretches the day, and it becomes easier to see how we drift.

What I find myself noticing is how this connects to momentum. You get going, and then the rhythm shifts. You begin again, and then it shifts back. It is not enough to stop you, but it is enough to slow you down.

So what do you do with that?

The answer is simple - you can start by making few small adjustments that reduce the swing.

• Start by narrowing the gap. If your weekday wake-up is 6:30am and your weekend wake-up is 9:30am, that three-hour shift is effectively a time zone change. Bringing that closer, even by an hour, makes a difference.

• Keep a consistent anchor. Waking up at roughly the same time each day tends to stabilize your rhythm more than focusing on bedtime alone.

• Use light deliberately. Morning light helps set your internal clock earlier, while late-night screen exposure pushes it later. You don’t need to eliminate screens, but being intentional about the last hour of the day can shift things.

And perhaps most useful of all, notice the pattern before trying to optimise it. Notice how you feel on a Monday versus a Wednesday. Notice when your energy arrives easily and when it doesn’t. That awareness tends to shape behaviour more effectively than rules.

This is not about perfect alignment. It is about reducing unnecessary resets so that your week feels like a continuation rather than a restart.

It’s a small idea, but it reframes how you think about energy, rhythm, and the shape of a week.

And once you see it, it’s hard to unsee.