Why Do You Sleep Badly the First Night in a New Place?
Why does a new bed, hotel room or sleep lab so often mean a bad first night? Here is what research on the first night effect says, how to soften it when you travel, and why one night of data never tells the whole story.
Short answer
You sleep badly the first night in a new place because of the first night effect. Research suggests your brain stays partly on guard in unfamiliar surroundings, so sleep onset is slower and sleep is lighter. It usually settles within a night or two. A single night away says little about your normal sleep.
Key facts
- The first night effect was described in a 1966 paper in Psychophysiology by Agnew, Webb and Williams, who found more wakefulness, less REM sleep and more fragmented sleep on the first laboratory night.
- In a 2016 Current Biology study of 35 healthy young adults, the left hemisphere showed lower slow-wave activity than the right on the first night only (Tamaki and colleagues).
- In a 2015 study in Sleep, the first night differed from later nights, and averaging three nights gave much more stable measures in both insomniacs and healthy controls.
- The Sleep Foundation advises a cool, dark, quiet room and familiar items away from home, and says sleep typically improves after the first night.
In this article
- What is the first night effect?
- Why does your brain sleep lightly in a new place?
- How common is it, and who is affected?
- How long does the first night effect last?
- How can you reduce it when you travel?
- Why do the first nights with a new sleep tracker or setting mislead?
- When is a bad first night more than a bad first night?
- Frequently asked questions
- Final thoughts
- Sources and further reading
What is the first night effect?
The first night effect is the tendency to sleep worse on your first night in an unfamiliar place, with slower sleep onset, more waking and lighter sleep than usual. Sleep researchers have known about it since the 1960s, and it is the reason hotel beds and sleep labs so often feel disappointing on night one.
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The original finding
The term comes from a 1966 paper in Psychophysiology by Agnew, Webb and Williams, who recorded volunteers sleeping in a laboratory and reported increased wakefulness, reduced REM sleep and more fragmented sleep on the first session. It was a warning that a first night may not describe how someone really sleeps.
What it feels like
A 2024 review in Sleep Research (Zhang and colleagues) lists longer time to fall asleep, shorter total sleep time and more time awake after sleep onset. The Sleep Foundation adds shorter REM sleep.
Why does your brain sleep lightly in a new place?
Your brain may keep part of itself on watch in unfamiliar surroundings, so sleep stays lighter and you wake more easily to unusual sounds. The leading evidence comes from a 2016 Current Biology study, which proposed a "night watch" in one hemisphere. Other explanations, such as stress and anxiety, may also contribute.
The night watch finding
Tamaki, Bang, Watanabe and Sasaki at Brown University studied 35 healthy young adults across three experiments, using brain imaging and polysomnography on two sleep sessions one week apart. On the first night, the left hemisphere showed lower slow-wave activity than the right, which means it was in lighter sleep. That imbalance was linked to how long people took to fall asleep.
When the researchers played unusual sounds, people woke faster on night one than on night two, and the more alert hemisphere reacted more strongly. The authors suggested this works like a night watch that helps detect possible threats in a new setting.
There are limits: the participants were young and healthy, and the team examined only the first sleep cycle.
Stress and anxiety as a second explanation
The 2024 Sleep Research review links the effect mainly to acute environmental stress and heightened anxiety. The two explanations are not rivals: a brain that senses novelty and a mind that feels a little on edge can both produce lighter sleep. See also how stress affects your heart rate.
How common is it, and who is affected?
The first night effect appears in most groups studied, including good sleepers and people with insomnia, but no single figure tells you how many travellers are affected. Studies measure it differently and individuals vary, so treat it as likely, not guaranteed.
Alcohol is a common travel variable, covered in how alcohol changes sleep quality.
People with insomnia
A 2024 study in the Journal of Sleep Research (Cox and colleagues) compared 61 people with insomnia disorder with 61 matched good sleepers over two consecutive lab nights. Both groups slept worse on the first night, but the measures affected differed between groups.
In the 2015 Sleep study by Gaines and colleagues, people with insomnia slept 21.5 minutes less on the first night than on later nights, compared with 5.3 minutes less for healthy controls. The effect may be larger for people who already sleep poorly.
How long does the first night effect last?
For most people the first night effect fades by the second night, though some measures may take longer to settle. In the original 1966 work, the changes faded quickly after the first session, and later research supports using more than one night to get a representative picture of someone's sleep.
Gaines and colleagues found that once participants were used to the equipment, their sleep was stable across consecutive nights, and that averaging three nights produced strong stability in both insomniacs and controls. Total sleep time was the most stable measure, while time to fall asleep was more affected by temporary circumstances.
Why this matters for medicine
A Chest Physician article cites Lechat and colleagues, who followed more than 67,000 people with home analyzers, and who concluded that single-night studies could lead to a 20% misdiagnosis rate in obstructive sleep apnea. This is a secondhand report, so read it as support for checking more than one night, not as an exact rate.
Myth vs fact
Myth: If you sleep terribly on the first night away, you are a bad sleeper or something is wrong.
Fact: Poor first nights were seen in healthy volunteers as well as people with insomnia, and in the original research the effect faded quickly.
How can you reduce it when you travel?
You cannot switch the first night effect off, but you can make a new room feel safer and more familiar: keep your routine, bring familiar items, and control light, temperature and noise. This follows Sleep Foundation guidance, and no tip is proven to remove the effect.
Routine and familiar items
The Sleep Foundation suggests bringing your own pillow if you rely on a particular type, a photo or other sentimental item for the nightstand, and a familiar scent from home. Keeping your usual wind-down routine may help too.
Light, temperature and noise
The Sleep Foundation recommends blackout curtains or an eye mask, keeping the room as dim as possible for at least an hour before sleep, and a cool room of around 60 to 67 degrees Fahrenheit. For noise, it suggests asking for a higher floor away from elevators and lobbies, and using earplugs or a white noise machine.
| Area | What to try | Why it may help |
|---|---|---|
| Routine and familiar items | Usual wind-down; own pillow, a photo, a familiar scent | Adds cues from your normal bedroom |
| Light | Blackout curtains or eye mask; dim the room for an hour before bed | Reduces light that can delay sleep or wake you |
| Temperature | Aim for about 60 to 67 degrees Fahrenheit | A cool room suits sleep |
| Noise | Higher floor, away from lifts; earplugs or white noise | Fewer unusual sounds to trigger waking |
Luna Ring
Judge a new setting by several nights, not the first one
A tracker will not remove the first night effect, but several nights of data show how your sleep settles. Luna Ring is a smart ring, worn on a finger, that tracks sleep stages, heart rate, HRV, SpO2 and body temperature trends, with no subscription required. Comparing night three with night one, rather than judging by night one alone, gives a fairer picture.
Why do the first nights with a new sleep tracker or setting mislead?
The first nights in any new setting, including a new tracker, a new bed or a new city, may not reflect your normal sleep, so compare several nights rather than judging by one.
Researchers use several nights for exactly this reason, and the Chest Physician article argues for multinight assessment over single-night studies.
Consumer wearables estimate sleep from signals such as movement and heart rate. They are not a replacement for a clinical sleep study and do not diagnose sleep disorders, but they can show your own trends over time.
Try this: 7-day experiment
- On your first week somewhere new (a trip, a new bed or a new tracker), write down each morning roughly how long you took to fall asleep, how often you woke, and how rested you feel from 1 to 5.
- Do not judge anything from night 1. Compare nights 1 to 3 with nights 4 to 7.
- If you wear a tracker, treat its numbers as estimates and look at the trend across nights, not any single reading.
- On day 7, ask whether sleep settled as the week went on. If not, change one more thing and repeat.
When is a bad first night more than a bad first night?
A bad first night is normal, but poor sleep that carries on for weeks, or comes with loud snoring, gasping or heavy daytime sleepiness, deserves a conversation with a doctor. The first night effect is short-lived by definition, so lasting trouble points elsewhere.
Who should take extra care
If you are pregnant, take medication that affects sleep, or have a medical condition, talk to a clinician before using sleep aids while travelling. Sedating tablets, alcohol and over-the-counter sleep products can interact with other medicines. Jet lag is a separate issue on top of the first night effect.
Frequently asked questions
Is the first night effect real or just in my head?
It is real. It was documented in a 1966 EEG study and has been reproduced since, including in a 2016 Current Biology study showing asymmetric brain activity on the first night. Anxiety may add to it, but measured changes in sleep onset, depth and waking occur in the lab too.
Does the first night effect happen at home?
Most research was done in sleep labs, so evidence for ordinary homes and hotels is less direct. The Sleep Foundation describes the same pattern for hotel stays and says sleep usually improves after the first night. If your own bad nights away are mild, that fits, but individuals vary.
How many nights does it take to adjust to a new bed?
Often one or two. The original 1966 research found changes faded by the second night, and a 2015 study found stable sleep across consecutive nights once participants were familiar with the setting. Some people take longer, especially if sleep is already poor. If trouble lasts weeks, speak to a doctor.
Does the first night effect happen when you sleep somewhere familiar?
The effect is tied to novelty, so familiar surroundings should reduce it. In the 2016 Brown University study, the asymmetry appeared on the first night but not the second, when the room was no longer new. That suggests unfamiliarity, rather than the lab alone, is what matters.
Can a sleep tracker show the first night effect?
It may show a longer time to fall asleep or more waking on a first night away, but consumer wearables estimate sleep rather than measure it as a lab does. They are not diagnostic. Use them to compare several nights, and talk to a doctor about persistent problems.
Should I take a sleep aid on the first night away?
Speak to a doctor or pharmacist before using any sleep aid. Sedatives and alcohol can interact with other medicines, and a 2024 review notes that sedative-hypnotics change the first night effect itself. Comfort steps such as a cool, dark, quiet room are a safer first move for most people.
Final thoughts
Here is the short recap.
- The first night effect is a well-documented pattern, with slower sleep onset and lighter sleep, and it usually fades within a night or two.
- Keeping your routine and controlling light, temperature and noise may soften a first night away, but nothing is proven to remove it.
- Judge any new setting or tracker over several nights, not one.
Your turn: What is your best trick for sleeping in a hotel or a new bed? Tell us in the comments.
Luna Ring
Track your own trends with Luna Ring
Sleep stages, heart rate, HRV, SpO2, body temperature trends, activity and recovery in a ring worn on your finger. No subscription required.
Sources and further reading
- Agnew HW Jr, Webb WB, Williams RL. The First Night Effect: An EEG Study of Sleep. Psychophysiology, 1966.
- Tamaki M, Bang JW, Watanabe T, Sasaki Y. Night watch in one brain hemisphere during sleep associated with the first-night effect in humans. Current Biology, 2016.
- Gaines J, et al. Short- and Long-Term Sleep Stability in Insomniacs and Healthy Controls. Sleep, 2015.
- Cox R, Rosler L, Weber FD, Blanken TF, Wassing R, Ramautar JR, Van Someren EJW. The first-night effect and the consistency of short sleep in insomnia disorder. Journal of Sleep Research, 2024.
- Zhang Y, Chen K, Xu Y, Wu H. Research progress on the first-night effect in polysomnography studies. Sleep Research, 2024.
- Chest Physician. Is it time to embrace a multinight sleep study? Chest Physician.
- Sleep Foundation. Sleeping Well in a Hotel. Sleep Foundation.
Keep reading
General information only, not medical advice. It does not replace guidance from a qualified healthcare professional. Speak to one about any health concern.