Heart rate.
Optical sensors shine light into your finger and read your pulse from the light that comes back. Your overnight heart rate, and your resting heart rate in particular, is most useful as a trend across weeks.
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PulseRing Pro
£89 one payment, no subscription
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See the full details firstSleep ring
A sleep ring that reads the night, paid for once.
A sleep ring is a smart ring you wear to bed. Optical sensors on the inside read your pulse through the skin of your finger, and the app turns the night into heart rate, HRV, blood oxygen and an estimate of your sleep stages. PulseRing Pro does this in a titanium ring of about 4 grams, then gives you one call each morning: push, maintain or rest. £89, with no subscription.
What it reads overnight
What a sleep ring actually measures.
HRV.
Heart rate variability is the small difference in timing from one heartbeat to the next, read from the same pulse signal. There is no single good number for everyone, so your own trend matters more than anyone else's figure. Our guide to what a good HRV is explains why.
Blood oxygen.
The ring also estimates your blood oxygen (SpO2) overnight. Treat it as a wellness reading, not a medical one: the ring is not a pulse oximeter and is not for checking a health condition.
Sleep stages, estimated.
The reference test for light, deep and REM sleep is an overnight lab study that records brain activity. A ring estimates stages from indirect signals instead. In a 2022 lab study of six wearables, the devices agreed with the lab on asleep or awake 86% to 89% of the time, but on the exact stage only 50% to 65%. More in our guide to sleep stages.
Movement and stillness.
Stillness is a clue that you are asleep, and traditional research wristbands, called actigraphs, score sleep from movement. A 2024 review in the journal Sleep found consumer devices now outperform actigraphy against a lab sleep study, though they still score some time awake in the night as sleep.
One call in the morning.
After about two weeks of wear, PulseRing Pro has learned your normal. Each morning it sets the night against that baseline and gives you one readiness score and one call: push, maintain or rest.
What it does not do
What PulseRing Pro cannot tell you.
No skin temperature.
PulseRing Pro does not read skin temperature, so it cannot show temperature trends. If those matter to you, a ring with a temperature sensor will suit you better, and we would rather you knew now.
It cannot hear snoring.
A ring reads your finger, not the room, so it has no way of knowing whether you snore. A partner, or a phone app that records sound overnight, will tell you more.
It does not detect sleep apnoea.
Or diagnose any other condition. PulseRing Pro is a wellness device, not a medical device. If your breathing stops and starts in your sleep, you make gasping, snorting or choking noises, or you always feel very tired in the day, the NHS says to see a GP.
Stages are estimates.
Telling light, deep and REM sleep apart was the weakest part of every wearable in the study above. One night with little deep sleep is not proof of a problem. Watch the weekly average instead.
Not an anti-snoring ring.
Search for sleep rings and you will also find magnetic and acupressure rings sold for snoring and sleep. That is a different kind of product. PulseRing Pro records your night. It does not claim to change it.
Ring or watch
For sleep, choose on comfort.
No clear winner on accuracy.
In the same 2022 study, three watches, a ring, a band and a forehead device were all valid for sleep timing and duration, and all needed work on stages. The better sleep tracker is the one you will wear every night.
Nothing on your wrist.
PulseRing Pro weighs about 4 grams and has no screen to light up the room. Some people find a watch bulky in bed; others dislike anything on a finger. Both are fair, and only you know which you are.
Up to 7 days per charge.
Every night on the charger is a night with no data. PulseRing Pro lasts up to 7 days per charge, so plan a daytime top-up and your nights stay covered.
What a watch does better.
GPS, live heart rate zones and a screen for workouts. PulseRing Pro has none of these. Training with a watch and sleeping in a ring is a sensible split. Our smart rings page compares the main options, and our ring versus watch comparison covers the trade-offs.
How to use one well
Two weeks to learn, then one change at a time.
Wear it every night.
For the first two weeks, just wear it. Same finger every night, snug enough that it does not spin, because a loose ring gives weaker readings. The morning call needs about two weeks of your data before it means much.
Read the week, not the night.
Single nights bounce around. In a study of 54 working adults wearing a research wrist monitor, more than 7 nights were needed for a reliable measure of total sleep time. Compare this week with last week, not last night with tonight.
Change one thing.
Keep one normal week, then change a single habit for the next: a fixed wake time, an earlier last coffee or a darker room. Compare the two weekly averages. Change three things at once and you will not know which one helped.
Trust the timing most.
Bedtime, wake time and total sleep are where wearables came closest to the lab. Overnight heart rate and HRV are useful as weekly trends. Treat deep and REM minutes as rough, and only act on large shifts that last.
Check it against your mornings.
Score how rested you feel from 1 to 5 before you open the app. If watching the score starts making your nights worse, look weekly or take a break. Sleep doctors have a name for the chase after a perfect score: orthosomnia.
The Sleep Reset System
The ring, plus the tools to test with.
PulseRing Pro.
Reads the night, so you can see whether a change shows up in your own data rather than guessing.
Peak Blackout.
A contoured sleep mask with moulded eye cups, so nothing presses on your eyelids. It covers the darker-room test.
Peak Airflow, 30 nights.
Drug-free nasal strips that lift the sides of your nose from the outside, so breathing through your nose takes less effort. Nothing goes inside.
Peak Mouth Tape, 30 nights.
It holds your lips closed. That is all it does, and it is not for everyone: skip it if your nose is blocked, if you have or might have sleep apnoea, asthma or another breathing condition, or after alcohol or sleeping tablets. Never use it on a child. Try it while awake first. The full guidance is on the Peak Mouth Tape page.
£129 for all four.
Bought separately they come to £145.97, so the set saves £16.97, and the ring inside has no subscription. See the Sleep Reset System.
Sleep rings: questions, answered
01Is a sleep ring worth it?
It is worth it if you will wear it every night and use the trend to change something, such as your wake time or your caffeine cut-off. Wearables tested in a sleep lab study were valid for sleep timing and length and weaker on stages. If you want a diagnosis, or you suspect you will stop looking after a week, it is not worth it.
02Is a sleep ring better than a watch for tracking sleep?
Neither is better at sleep tracking in general. In a 2022 lab study, watches, a ring and a band were all valid for sleep timing and duration, and all needed work on stages. Choose on comfort: a ring is smaller and has no screen, so it can be easier to sleep in, while a watch is better for GPS and live workout data.
03Can a sleep ring detect sleep apnoea?
No. PulseRing Pro does not detect or diagnose sleep apnoea or any other condition, and a normal score does not rule anything out. The NHS says to see a GP if your breathing stops and starts while you sleep, you make gasping, snorting or choking noises, or you always feel very tired during the day. A GP can refer you to a sleep clinic for tests.
04Do I need a subscription?
No. PulseRing Pro costs £89 once. Heart rate, HRV, blood oxygen, sleep stage estimates and the daily readiness score are included for as long as you own the ring.
05How long does the battery last?
Up to 7 days per charge. Charge it during the day, for example while you are at your desk, so you do not lose a night of data.
06What size sleep ring do I need, and which finger?
PulseRing Pro comes in US sizes 7 to 14. Size the finger you will wear it on, measured at the end of the day when fingers are largest; the index finger of your non-dominant hand is a good place to start. Larger hands are covered on our smart ring for men page. If you do not know your size, the PulseRing Sizing Tape costs £6.99, refunded against your ring: your order confirmation includes a code for £6.99 off, used with the same email address. Every ring order also includes one free size exchange.
07Can I wear it in the shower or the pool?
Yes. PulseRing Pro is rated 5ATM, so it can stay on in the shower and the pool. Fewer reasons to take it off means fewer nights you forget to put it back on.
08What does PulseRing Pro not do?
It does not read skin temperature, cannot hear or detect snoring, and does not detect or diagnose sleep apnoea or any other condition. Its sleep stages are estimates, and it has no GPS. It is a wellness device, not a medical device. If you want temperature data, a ring with a temperature sensor suits you better; if you are worried about your sleep, start with your GP.
Wear it for two weeks. Then judge it.
PulseRing Pro is £89 once, with no subscription. Free UK delivery, 30-day returns, one free size exchange and a 12-month warranty.
