Sleep Technology: Trackers, Apps and Smart Devices Explained
Consumer sleep trackers are reasonably good at estimating when you slept and poor at identifying sleep stages. They help build habits; they do not diagnose sleep disorders. Digital CBT-I programmes are the exception: they have strong evidence for insomnia.
Key points
- What trackers measure. Most use movement and heart rate to estimate sleep and wake.
- Where they help. They make your pattern visible, which supports routine changes.
- Where they mislead. Worry about numbers can itself disturb sleep, a pattern clinicians have named orthosomnia .
- Online programmes. Structured digital CBT-I programmes follow the same steps as clinic-delivered CBT-I, the first-line treatment for chronic insomnia.
What trackers measure
Most use movement and heart rate to estimate sleep and wake. Stage estimates (light, deep, REM) are less reliable than total sleep time.
Where they help
They make your pattern visible, which supports routine changes. They can also help you prepare for a doctor visit.
Where they mislead
Worry about numbers can itself disturb sleep, a pattern clinicians have named "orthosomnia". Do not use a tracker to diagnose sleep apnoea or insomnia.
Online programmes
Structured digital CBT-I programmes follow the same steps as clinic-delivered CBT-I, the first-line treatment for chronic insomnia.
This guide in numbers
Start with these guides
Sleep technologyWhat Is a Sleep Tracker and How Does It Work?How wearables and under-mattress sensors estimate sleep, what they get right and wrong, and who benefits.
Sleep technologyHow to Understand Your Sleep Tracking ReportRead tracker reports calmly: what totals, stages, heart rate and scores mean and which to ignore.
Sleep technologyWhat Is REM Sleep?What REM sleep is, when it occurs and how trackers estimate it.
Sleep technologySmartwatch vs Dedicated Sleep TrackerWrist watches, rings and under-mattress sensors compared on comfort, battery, accuracy and privacy.Sleep technologyHow Accurate Are Consumer Sleep Trackers?What validation studies find: good at total sleep, weaker at stages and wake detection.
Sleep technologyWhat Is Deep Sleep and How Is It Estimated?Slow-wave sleep explained, how laboratories measure it and how wearables estimate it.All guides in this pillar
| Guide | Topic | Read | Words | Review |
|---|---|---|---|---|
| What Is a Sleep Tracker and How Does It Work? | Sleep technology | 2 min | 442 | Editorial team |
| How to Understand Your Sleep Tracking Report | Sleep technology | 2 min | 323 | Consultant reviewed |
| What Is Deep Sleep and How Is It Estimated? | Sleep technology | 1 min | 272 | Consultant reviewed |
| How Accurate Are Consumer Sleep Trackers? | Sleep technology | 1 min | 273 | Consultant reviewed |
| Smartwatch vs Dedicated Sleep Tracker | Sleep technology | 1 min | 292 | Consultant reviewed |
| What Is REM Sleep? | Sleep technology | 2 min | 302 | Consultant reviewed |
| Are Smart Mattresses Worth Buying? | Sleep technology | 1 min | 250 | Editorial team |
| What Are Cooling Mattress Technologies? | Sleep technology | 1 min | 243 | Editorial team |
| What Is a Smart Pillow? | Sleep technology | 1 min | 253 | Editorial team |
Frequently asked questions
Can a smartwatch diagnose sleep apnoea?
No. Some devices flag possible breathing disturbances, but a clinician must confirm with a proper test.
Should I trust deep-sleep numbers?
Treat stage numbers as rough estimates.
Is CBT-I available online?
Yes, from several providers; look for clinical testing and clinician access.
Where we deliver
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