Why You’re More Tired on Holiday (The Science of Sleep Debt & Social Jet Lag)

Holidays are meant to restore you.
But more often than not, they leave you feeling more exhausted than when you left.

And it’s not just in your head.

Research shows that 8 in 10 travellers build up sleep debt while travelling, with half of holidays negatively impacted by lack of sleep.

So why does time away (something designed to recharge you) end up draining you instead?

What is sleep debt and why it builds so quickly

Sleep debt is the difference between how much sleep your body needs and how much you actually get.

When you travel, it accumulates fast:

     - Early flights cut into sleep

     - Late nights extend your wake window

     - New environments disrupt sleep quality

Even before you leave, your sleep is already affected. Studies show people lose “30–50 minutes of sleep the night before travel” alone.

And once you arrive, it doesn’t improve.

Travel physically reduces sleep quality

It’s not just timing, it’s the quality of sleep itself.

Large-scale sleep studies show:

    - Sleep during travel is shorter and lower quality

    - Environmental factors like noise, pressure, and discomfort all contribute

Even after you land, your body doesn’t immediately recover.

Research shows:

    + Sleep duration may recover within a couple of days

    + But sleep timing and structure can remain disrupted for over a week

Meaning: you may be “sleeping,” but not truly restoring.

It’s not just jet lag, it’s social jet lag

You don’t need to cross time zones to feel jet lag.

Social jet lag happens when your lifestyle shifts away from your natural body rhythm.

On holiday, this is almost unavoidable:

    - Staying up later than usual

    - Sleeping in inconsistently

    - Eating and moving at different times

When your internal clock no longer aligns with your behaviour, it affects:

    - Mood

    - Energy

    - Focus

    - Physical recovery

Studies show this mismatch can negatively impact cognitive function, emotional control, and behaviour.

The role of your circadian rhythm

Your body runs on a 24-hour internal clock, your circadian rhythm.

Travel disrupts it in multiple ways:

    - Light exposure changes

    - Meal timing shifts

    - Sleep/wake cycles move

When this rhythm is misaligned:

    - Sleep becomes lighter and more fragmented

    - You feel tired during the day

    - You struggle to fall asleep at night

Jet lag itself is simply this misalignment taken to an extreme, often causing fatigue, insomnia, and reduced mental performance.

Why you feel worse as your trip goes on

The key issue isn’t one bad night, it’s accumulation.

Sleep debt + circadian disruption = compounding fatigue

Research shows:

    - Sleep and alertness are significantly reduced for up to 48 hours after travel

    - Fatigue can remain elevated for days, even weeks in some cases

This is why:

    - You feel fine at first

    - Then increasingly drained

    - And often return home needing recovery time

In fact, 79% of travellers say they come back needing another holiday just to recover!

The real problem: you’re not giving your body signals to rest

Your body doesn’t just fall asleep, it needs cues.

These include:

    - Consistent timing

    - Reduced stimulation

    - Signals that the day is ending

When travelling, those signals disappear.

Instead, your body receives:

    - Light late into the evening

    - Irregular schedules

    - Increased stimulation

Without a clear “switch-off,” your system stays active, even when you’re exhausted.

 The solution: create consistency, not control

You don’t need a perfect routine on holiday.
But you do need a moment of consistency.

A simple, repeatable wind-down ritual can:

     - Signal to your body that it’s time to rest

     - Reduce the impact of social jet lag

     - Improve sleep quality, even in new environments

Your travel sleep ritual

Wherever you are - hotel, Airbnb, or home, focus on these four steps:

1. Switch off, anywhere
Create a pause in your day with a warm shower or bath to signal rest

2. Soothe tired muscles
Release tension from walking, travel, and long days

3. Restore and reset
Nourish your body and bring it back into balance

4. Prepare for sleep
Give your body the cue it needs to fully switch off

Introducing the Jet Set Kit

Your complete wind-down ritual, designed for nights away.

Featuring:

    + 15ml Bed Balm

    + 30ml Among the Stars Body Oil

    + 30ml Into the Deep Bath Oil

    + 10ml Night Drops

Everything you need to reduce sleep disruption, support your body clock, and wake up feeling restored, wherever you are.

Final thought

Travel doesn’t have to leave you exhausted.

The difference isn’t how much you do.
It’s how well you rest.

Sources

Airport Dimensions – 8 in 10 travellers say they suffer sleep debt
https://www.airportdimensions.com/news-and-insights/8-in-10-travelers-say-they-suffer-sleep-debt-airport-dimensions-research

University of Portsmouth – Social jet lag and travel fatigue
https://www.port.ac.uk/news-events-and-blogs/news/travellers-clocked-out-by-social-jetlag-how-travel-fatigue-shapes-holiday-plans

Sleep Journal (Oxford Academic) – Sleep disruption during travel
https://academic.oup.com/sleep/article/48/7/zsaf077/8092480

Oura – How travel affects sleep patterns
https://ouraring.com/blog/how-jet-lag-affects-sleep

Skyscanner – Jet lag and post-holiday fatigue insights
https://www.skyscanner.net/news/jet-lag-guide