I wake up in the morning and see my smartwatch talking about my sleep score, or some devices say, "You spent 3 hours in deep sleep." How seriously should I take this? Can these devices actually distinguish between sleep stages (REM, light, deep), or are they just making guesses? If the measurements are unreliable, what should I focus on when evaluating my sleep quality?
Do smartwatches really measure sleep data accurately?
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Smartwatches that track sleep data aren't really that reliable, bro—especially the part where they try to distinguish deep or REM sleep, that always made me skeptical. Since they mostly base their estimates on movement and heart rate, they just can't hit true precision. If you actually want to understand your sleep quality, you should look into more professional methods.