Stage 3: During deep sleep, you become less responsive to outside stimuli. So there’s a lot of body maintenance occurring during lighter stages of sleep.” Breathing and heart rate typically decrease slightly during this stage. “It’s when your body processes memories and emotions and your metabolism regulates itself. “Light sleep is very important because it takes up more than half of the night,” says Grandner. That said, stage 2 sleep is not shallow, nor is it less important than other sleep stages. Stage 2: When people talk about light sleep, this is the stage they’re usually referring to. “Your brain has dipped into sleep but you don’t feel like you’re asleep.” “But it’s usually just a quick transition, so you’re not in it for very long.ĭuring stage one, “you’re still hearing things and have a sense of awareness,” says Fitbit sleep consultant Allison Siebern, PhD, consulting assistant professor at The Stanford Center for Sleep Sciences and Medicine and director of Sleep Health Integrative Program at the Veterans Affairs Medical Center in Fayetteville, NC. Stage 1: “This is the sleep that’s a little more choppy, shallow, not restful,” says Michael Grandner, MD, director of the Sleep and Health Research Program at the University of Arizona in Tucson and a Fitbit sleep consultant. In the app, your sleep will fall into three stages: light, deep, and REM. Sleep researchers divide sleep into five stages-stages 1, 2, 3, and REM-but to keep things simple, Fitbit groups like sleep stages together. Below, a breakdown of what you need to know about each sleep stage. Pretty cool, right? Each of these stages-or sleep types-serve a different purpose, so understanding how much of each stage you log can help you identify and address sleep-related issues. By tapping into your nighttime heart rate and movement patterns, these devices will be able to estimate how much time you spend in light, deep, and rapid eye movement (REM) sleep. Waking up tired, angry, or cranky? If you use a Fitbit Alta HR, Fitbit Charge 3, Fitbit Versa, Fitbit Ionic, or Charge 4, your sleep data may soon be able to reveal why.
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