Did you get a smartwatch, fitness tracker, or smart ring over the holidays? If so, you’re not alone! Many people are now waking up to sleep scores, heart-rate graphs, and insights about how well they’re (supposedly) resting each night.

Smart rings and watches can be incredibly helpful tools. They track movement, heart rate, and oxygen levels to estimate how long you slept, how often you woke up, and even how much time you spent in different sleep stages. But while the data can be interesting and even motivating, it naturally raises an important question:

How accurate are these devices, really?

Wearables can give you valuable clues about your sleep habits, but they aren’t designed to diagnose sleep disorders or replace a professional sleep study. Understanding what your device can and cannot tell you is the key to using it effectively — and knowing when it’s time to take the next step in your sleep health journey.

How Smart Rings and Watches Track Sleep?

Most smart rings and watches use a combination of sensors, like movement tracking (actigraphy), heart rate, and sometimes oxygen levels, to estimate your sleep cycles. While these devices can’t measure brain activity the way a medical sleep study does, they do a good job of spotting trends and helping you notice patterns, such as:

• How long it takes to fall asleep
• How many times you wake up at night
• Whether your sleep is consistent from day to day

These tools are most useful for tracking habits over time, not for diagnosing sleep disorders. And remember: one “bad night” or low sleep score isn’t something to panic over. What matters most is the pattern. If you consistently get low scores or your nights feel restless, that’s when further evaluation can help.

Understanding Sleep Stages: REM, Deep, and Core Sleep

Most wearable devices break your rest into three or four stages. Here’s what each one means:

• Light (or Core) Sleep: This makes up about 50-60% of your night. It’s when your body transitions between sleep stages, and you can wake easily.
• Deep Sleep: This restorative stage is when your body repairs tissues, builds bones and muscle, and strengthens your immune system. Adults typically spend about 15-20% of their night in deep sleep.
• REM Sleep: REM stands for “rapid eye movement.” It’s when you dream and your brain processes memories and emotions. Around 20-25% of your sleep should be REM.

If your data shows you’re consistently missing out on deep or REM sleep, it could be a sign of poor sleep quality or a sleep disorder such as sleep apnea.

How to Use Sleep Data to Improve Sleep Quality?

Smart devices can help you spot patterns that affect your rest. Try using the data to answer questions like:

• Do I sleep worse after caffeine or screen time at night?
• Am I getting enough total hours of sleep?
• Does my sleep improve when I exercise or stick to a schedule?

These insights can guide healthy habits like setting a consistent bedtime, reducing blue light before bed, and creating a cool, dark sleep space. Wearables are great for accountability and awareness, but they can’t always explain why your sleep score is low. That’s where a sleep specialist can help.

When to Seek Professional Help

If your smartwatch or ring keeps showing restless nights, frequent awakenings, or unusually low oxygen readings, you may benefit from a sleep study. These studies can identify underlying conditions such as sleep apnea, insomnia, or restless leg syndrome, which are things wearable devices can’t detect on their own.

Think of your wearable as the “first clue,” and a sleep study as the full picture. When the data doesn’t look right or the trends continue, it’s worth investigating.

Smart rings and watches are excellent tools for tracking sleep habits and keeping you accountable.  But they can’t replace the accuracy of a professional sleep study. Use your device as a guide. And, if your numbers still don’t look right, we’re here to help you uncover the real cause and get back to truly restorative sleep.

Next Steps: We’re Here to Help

At Sleep Wellness Center, we’re here to guide you every step of the way. The first step is a simple consultation, starting by scheduling an appointment with Dr. Mathison or with another sleep specialist of your choice. They’ll review your symptoms, discuss your sleep concerns, and determine whether a sleep study is right for you.

If one is recommended, your provider can send a referral directly to Sleep Wellness Center. From there, our team will reach out to schedule your study, walk you through the process, and make sure you feel completely comfortable every step of the way. 
If you have questions about the process or want to learn more, contact us here. A restful night’s sleep is possible, and it’s one of the best things you can do for your long-term health.