Sleep Trackers and Insomnia: When Your Wearable Fuels Sleep Anxiety
You wake up, and before your feet touch the floor, you check your sleep score. A 62. Another “poor” night. Your shoulders tighten, your mood sinks, and you spend the rest of the day bracing for exhaustion — even though, if you’re honest, you felt roughly fine ten minutes ago.
If this sounds familiar, you’re not alone, and you’re not imagining the effect. A growing body of research shows that sleep trackers and smart rings, designed to help us understand our sleep, can end up doing the opposite: fuelling the very anxiety that keeps insomnia going. Clinicians have a name for it — orthosomnia — and it’s becoming a common presenting problem for people seeking insomnia treatment.
What Is Orthosomnia?
Orthosomnia describes an unhealthy preoccupation with achieving “perfect” sleep, driven by data from a wearable device. The term was coined by US sleep physicians who noticed patients arriving in clinic more distressed by their tracker’s readout than by how they actually felt during the day.
Recent survey data suggests this isn’t a fringe issue. Depending on how strictly it’s defined, studies estimate that somewhere between 3% and 14% of regular sleep-tracker users show signs of orthosomnia — checking their scores compulsively, adjusting their day around a number, or feeling genuine distress when the app tells them they slept badly.
How Many of Us Are Doing This?
Wearable sleep tracking has gone mainstream. Surveys suggest roughly one in three adults now use a smartwatch, ring, or phone app to monitor their sleep, and this pattern is just as familiar across the UK as it is elsewhere. Most people report a neutral or even positive experience: feeling more aware of their habits, or reassured that their sleep is “fine.”
But the picture isn’t even across age groups. In one recent survey, around 23% of adults aged 18–35 said sleep-tracking apps made them feel more stressed about their sleep, compared with just 2.4% of those over 66. Younger, more data-engaged users appear considerably more vulnerable to letting a score dictate how they feel — which matters, because for people already struggling with insomnia, that extra layer of worry is rarely helpful.
Why Sleep Trackers Often Get It Wrong
Part of the problem is accuracy. Consumer wearables estimate sleep using movement and heart-rate data, not the brainwave monitoring used in a sleep laboratory. Compared with clinical polysomnography, most devices are accurate to within roughly 20–30 minutes for total sleep time on a good night — but the error grows considerably in people with fragmented, poor-quality sleep, which is exactly the group most likely to be checking their scores obsessively.
Sleep stage detection is even less reliable. Independent testing of popular rings and watches has found REM sleep is routinely underestimated by 50–70%, with some nights showing errors of more than two hours. Trackers also tend to overestimate total sleep time and underestimate how long someone was actually awake — the opposite pattern to how many people with insomnia perceive their own night, which can create a confusing, contradictory picture that fuels rather than resolves anxiety.
The Power of a Bad “Sleep Score” — What the Research Shows
Perhaps the most striking evidence comes from a study at the University of Oxford, in which participants wore a sleep-tracking device that displayed a score generated at random, entirely unrelated to how they’d actually slept. The people told they’d slept badly went on to report feeling significantly more fatigued the next day — regardless of their real sleep quality.
This is a textbook nocebo effect: the belief that we’ve slept badly can make us feel worse than the sleep itself would justify. It’s a powerful illustration of something CBT-I practitioners see constantly in clinic — how much daytime fatigue and distress is shaped by what we believe about our sleep, not only by the sleep itself.
When a Tracker Helps, and When It Hurts
Wearables aren’t inherently bad for sleep. Used lightly, they can be genuinely useful. The difference tends to come down to how you relate to the data.
- Likely helpful: Noticing broad patterns (later bedtimes on weekends, less activity on poor-sleep days) without checking the app first thing every morning.
- Likely unhelpful: Checking your score before you’ve even assessed how you feel, letting a “bad” number decide your mood or plans for the day.
- Likely unhelpful: Trying harder and harder to “optimise” your score — extra time in bed, rigid routines, supplements — often the very behaviours that make insomnia worse.
- Likely helpful: Using a simple, low-tech sleep diary alongside or instead of a device, focused on how you feel rather than a precise score.
What NICE Actually Recommends for Insomnia
UK guidance from NICE is clear: cognitive behavioural therapy for insomnia (CBT-I) is the recommended first-line approach, to be offered before or alongside any medication. NICE has also recognised structured digital CBT-I programmes as a legitimate route to care, given how few NHS patients currently have access to a trained therapist.
Nowhere in that guidance is a sleep tracker mentioned as a treatment. That’s because the evidence-based insomnia treatment that actually changes long-term sleep works on the beliefs, habits and anxiety around sleep — not on chasing a better number on a screen. CBT-I retrains the relationship between your bed and sleep, tackles the racing mind that arrives at bedtime, and directly addresses the kind of sleep-related worry that a bad tracker score can trigger. If you want to understand the mechanism in more depth, our page on why CBT-I works goes through the evidence in detail, and if you’d rather avoid medication altogether, our guide to insomnia treatment without medication explains the alternative.
Breaking Free From the Tracker: Practical Steps
If you suspect your wearable has become part of the problem rather than the solution, a few small changes can make a real difference:
- Delay the check. Wait an hour after waking before looking at your sleep score, giving your own body a chance to tell you how you feel first.
- Hide the score, keep the data. Most apps let you turn off the daily summary notification while still logging data in the background.
- Notice the story you tell yourself. A low score doesn’t mean your day is doomed. If you’re waking overnight, our piece on why you wake up during the night explains what’s normal and what isn’t.
- Take a break entirely. Many people are surprised how much lighter their sleep-related anxiety feels after a two-week break from any tracking device.
- Address the anxiety directly. If checking your score has become compulsive, that’s a sign the underlying sleep anxiety needs treating, not just the habit.
For quicker, practical strategies for the night itself, see our guide on how to fall asleep fast.
Frequently asked questions
Can a sleep tracker actually cause insomnia?
A tracker alone doesn’t cause insomnia, but it can worsen sleep-related anxiety and unhelpful behaviours (like extra time in bed trying to “fix” a low score) that keep insomnia going. This pattern, sometimes called orthosomnia, is well documented in sleep research.
Are sleep trackers accurate enough to trust?
Consumer wearables are reasonably good at detecting whether you’re asleep or awake, but far less reliable at measuring sleep stages, and they tend to be least accurate for people with fragmented or poor-quality sleep. Treat the numbers as a rough guide, not a clinical measurement.
Should I stop using my sleep tracker if I have insomnia?
Not necessarily, but if checking your score affects your mood or makes you anxious about sleep, a temporary break is often helpful. Many people find a simple sleep diary more useful for insomnia treatment than a device-generated score.
What actually treats insomnia, if trackers don’t?
Cognitive behavioural therapy for insomnia (CBT-I) is the treatment recommended by NICE as the first-line approach for insomnia in adults. It addresses the habits, beliefs and anxiety that maintain poor sleep, rather than simply monitoring it.
The Bottom Line
A wearable can be a useful nudge towards better habits, but it was never designed to diagnose or treat insomnia — and for many people, it quietly makes sleep-related anxiety worse rather than better. If checking your sleep score has become part of a stressful nightly and morning ritual, that’s worth taking seriously, not brushing off.
The good news is that insomnia, however it’s being fuelled, responds well to the right treatment. Take our free insomnia self-assessment to get a clearer picture of what’s going on, or get in touch to talk to a specialist about CBT-I. As always, if you’re taking any sleep medication, speak to your GP before making any changes — don’t stop or adjust it on your own.