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Oura Crew | Sep 5, 2017

How to Measure Sleep | Get to Know the Oura Sleep Score

What is the right amount of sleep for me? How do I know if I’m sleeping well? How to measure sleep? These are common questions for many of us. Until now and outside sleep laboratories, it was very difficult to track sleep objectively.

At Oura, we believe that sleep is one of the main pillars of health, just as important as diet or exercise. Sleep removes toxins from your brain, and that is one of the reasons why it is necessary in helping your body to recover. A chronic lack of sleep can trigger a wide array of health issues such as obesity, heart disease, diabetes, and high blood pressure. So it stands to reason that we should be allowed to monitor our sleep just like our food intake and our activity.

What You’ll Learn in This Article

The Problem: How to Measure Sleep

The problem with sleep monitoring is that most people outside sleep clinics don’t have tools with which to track sleep accurately. We do have hunches of how we slept when we wake up, but sleep still remains somewhat invisible to us. For example, without a measuring device, we cannot really know whether we had enough deep or REM sleep. Moreover, how many of us remembers how we slept, say, a couple of weeks ago? Knowing it would be helpful, though, because our “sleep history” can have a significant effect on our readiness today. We can also misinterpret our sleep quality: having a feeling that you slept like a log doesn’t necessarily mean that your sleep would’ve been especially restorative.

If we don’t know what our sleep quality is, we cannot act proactively. In the very worst case this can lead to a situation where we start to learn more about our sleep only after we’ve developed some sort of a severe sleeping disorder, and need to consult a sleep clinic. Whilst the professionals there can really dig deep into sleep, it’s usually only a night or two when sleep is examined. Many sleep tracking devices are also quite uncomfortable to wear.

And even though most of us don’t luckily suffer the very worst forms of sleeping disorders, we all do face the problem that we don’t have accurate, long-term data of how we sleep, and how our sleep quality affects us.

To summarize, we face problems in:

Tracking Sleep With the Oura Wellness Ring

One of the biggest motivations to develop the Oura ring was to offer a reliable, convenient, and usable solution to measure and analyze sleep quality. We here at Oura do understand that sleep is nothing to be joked around, and therefore Oura’s sleep staging algorithms are based on years of scientific research. They are also independently validated by SRI International.

We want you to be able to get insight about your sleep every day and throughout the year(s). The Oura ring is therefore very unobtrusive in its sleep tracking: it doesn’t disturb your sleep, but with highly accurate sensors quietly measures body signals such as your resting heart rate (RHR), heart rate variability (HRV), respiration rate, body temperature, and movement. (Read more about the ring technology).

Using the collected data, Oura can help you to qualify your sleep every night, and also in the longer term. The Oura app and Oura Cloud show you your sleep metrics in easy-to-read format and visualizations. You’ll also get guidance on what the different metrics mean, and on ways to improve your sleep quality within time.

I know how to be active and eat healthy, but I’ve never been really good at recovering and getting enough sleep. This is why Oura has been my number one choice.
– Nelli Lähteenmäki, CEO of Fifth Corner Inc. Watch the video.

The Sleep Score

The core measure of your sleep is your daily Sleep Score – a metric, which is based on several sleep-related contributors Oura tracks both in short and long term. The score ranges from 0-100%, and as a rule of thumb: the higher it is, the better, more restorative sleep you have had.

Daily sleep metrics in the Oura app

Though, do remember that the human body is very complex, and you and your sleep are unique. So, don’t focus too much on any one sleep contributor, but follow the Sleep Score in conjunction with your own feelings of how refreshed or tired you are. Comparing your score with other people isn’t useful for you, either.

What Does Oura Track to Help You Measure Your Sleep

Here are the contributors Oura uses to calculate your Oura Sleep Score. Next we’ll go through why they’re important and what you can learn from them.

Total Sleep

This contributor shows you the total amount of sleep you achieved the previous night, including light, REM and deep sleep. Note: here we speak about actual sleep – the total time you spent in bed does not necessarily equate with the amount of total sleep. Even though the amount of sleep one needs is individual, most adults require between 7-9 hours of sleep per night.

Efficiency

Put simply, efficiency means the percentage of time you spent sleeping while in bed. The longer the bar, the more efficient your sleep was. Hypnograms in the Oura app and Cloud show you in more detail when you were awake, and when sleeping. In general, a sleep efficiency score of 85% or above shows that you fall asleep quickly enough (in less than 20 minutes) and don’t wake up too often during the night. Again, do remember that your sleep habits are individual, and it’s for example perfectly normal that when you get older, you might wake up more often during the night – it’s just one of those things we may need to accept.

Disturbances

Disturbances is the other side of the efficiency coin. It tells you the total time you spent awake. Disturbances such as wake-ups, get-ups and restless time during your sleep can have a big influence on your sleep quality, resulting in less restorative sleep. They can be one of the reasons behind daytime sleepiness, for example. Obviously, many things can cause your sleep to be interrupted, but things such as stress, noise, sleep buddies, light, room temperature, infections, or late-time activities (exercise, screentime, heavy meals) are on the list of potential suspects.

REM Sleep

REM is short for rapid eye movement. This is the stage of your sleep that is associated with dreaming, but also with memory consolidation, learning and creativity. In other words, this is the stage that energizes your mind. The amount of REM sleep one gets varies a lot, between nights and between individuals. However, it usually makes up about 20-25% of your total sleep time. Oura shows you both the total amount of REM sleep you got, and in the hypnogram also the times when you were in the REM sleep stage. By the way, the amount of REM sleep is one of the things that can decrease with age.

Deep Sleep

Deep sleep is considered the most restorative and rejuvenating stage of sleep. This is the stage where your muscle repair and growth takes place, your body is relaxed, blood pressure lower, and it’s also harder to wake you up. The amount of deep sleep varies between nights and individuals, on average adults spend some 15-20% of their total sleep time in deep sleep (with age, you’ll probably get less of deep sleep). It’s said that regular physical activity, and avoidance of stuff such as heavy meals and alcohol before bedtime or long naps and caffeine in the afternoon, could increase the amount of deep sleep.

Sleep Latency

This is the amount of time it takes for you to fall to sleep. Again, sleep latency is highly personal, but a rule of thumb is that it shouldn’t take you more than 15-20 minutes to fall asleep. There are many reasons that might lead to your sleep latency to decrease. Exposure to too much blue light, a later dinner and/or alcohol too close to bedtime are among those. Bear in mind that also dozing off in less than 5 minutes can indicate something, most commonly that you haven’t slept enough the previous night.

Sleep Timing

Every human has a biological clock, which is aligned to day/night cycles. All of our essential biological processes such as body temperature, hormone releases and hunger operate on 24-hour cycles known as the circadian rhythms. There are differences in our rhythms, though. Some of us are more morning oriented, some are evening people, and others somewhere in-between. Regardless of the orientation, having a consistency in your rhythm is important. Also, having the midpoint of your sleep somewhere between midnight and 3am is preferred from your sleep quality point of view.

Light Sleep

In addition to the contributors above, the Oura Ring also measures the third stage of your sleep, Light sleep. Even though it’s not one of the Sleep Score measures per se, it is included in the Total Sleep contributor. And it’s there for a reason, since light sleep is not in any way insignificant. First of all, we usually spend almost half of our total sleep time in light sleep. It’s also the stage which typically starts our sleep cycle, and prepares our bodies to transitions between different sleep stages throughout the night.

If you’re interested in tracking your sleep and you don’t yet have the tools for it, have a look at the Oura ring in the Oura Shop. If you have an Oura ring, have a look at our Sleep FAQ for more answers or dig deep into your data in the Oura Cloud Beta.

What Is Heart Rate Variability And What You Can Learn From It

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