Flex 2'S Sleep Tracking: How Does It Work?

The Fitbit Flex 2 is a slim, waterproof fitness tracker that can be worn on the wrist, ankle, or as a necklace. It can track sleep by detecting movement and heart rate patterns. When the device hasn't moved for about an hour, it assumes that the wearer is asleep. It also tracks the beat-to-beat changes in heart rate, which fluctuate as the wearer transitions between light sleep, deep sleep, and REM sleep stages. The Flex 2 provides weekly, monthly, and annual data readouts, allowing users to track their sleep patterns over time.

The Flex 2 tracks sleep through movement and heart rate

The Flex 2 is a fitness tracker by Fitbit. It is an upgrade over the original Flex, with a slimmer and more water-resistant design. The Flex 2 can be worn as a wristband, bangle, or pendant. While it lacks a screen, it can be linked to a smartphone or computer to track a variety of health and activity data.

The Flex 2 can monitor sleep, in addition to tracking activity, food, weight, and other health metrics. To track sleep, the Flex 2 uses a combination of movement and heart-rate patterns. When the device senses that the wearer hasn't moved for about an hour, it assumes that they are asleep. It also takes into account the length of time that movements are indicative of sleep behavior, such as rolling over.

During sleep, the Flex 2 tracks the beat-to-beat changes in the wearer's heart rate, known as heart rate variability (HRV). These changes fluctuate as the wearer transitions between light sleep, deep sleep, and REM sleep stages. By tracking these changes, the Flex 2 can estimate the wearer's sleep cycles from the previous night.

It is important to note that the Flex 2 is designed to be worn on the wrist during sleep. If worn as a loose-fitting accessory, such as a bangle or pendant, it may not accurately track sleep and steps. This is because the tracker needs to be able to detect the body's movements throughout the night, which may not be possible if it is laying on a mattress or other surface.

It is recommended to wear the device on the wrist at night

The Fitbit Flex 2 is a slim, waterproof wristband that can track your sleep, in addition to a host of other health metrics. It is recommended to wear the device on the wrist at night to accurately track sleep. This is because the tracker needs to be able to see your body's movement throughout the night. If worn on a chain, the tracker may be laying on the mattress and unable to detect your movement.

The Flex 2 estimates your sleep using a combination of your movement and heart-rate patterns. When you haven't moved for about an hour, the tracker assumes you're asleep. Additional data, such as the length of time your movements are indicative of sleep behaviour (e.g. rolling over), help confirm that you're asleep. The device also tracks beat-to-beat changes in your heart rate, known as heart rate variability (HRV), which fluctuate as you transition between light sleep, deep sleep, and REM sleep stages.

The Flex 2 is a solid upgrade over the original Fitbit Flex, with a more modern design and features. It is 30% smaller than the original, making it one of the slimmest fitness trackers available. The device can be worn as a pendant or bangle, but for workouts and sleep, it is recommended to wear the classic wristband. This is because wearing the device on the wrist provides the most accurate tracking.

The Flex 2 is a discreet, comfortable, and easy-to-use device that can help you track your sleep and overall health and fitness. By wearing the device on your wrist at night, you can accurately track your sleep patterns and gain insights into your sleep quality.

The device can be worn as a necklace but may not track sleep

The Fitbit Flex 2 is a slim, water-resistant wristband that can automatically track sleep and specific types of exercise. It can be worn while swimming, in the shower, and during other activities. The Flex 2 can be purchased with an accessory pendant that allows it to be worn as a necklace. However, wearing the device as a necklace may prevent it from accurately tracking sleep.

While the Flex 2 can be worn as a necklace, it may not be able to accurately track sleep when worn in this way. Sleep tracking requires the device to detect the user's body movements throughout the night. When worn on a necklace, the device may be laying on the mattress rather than on the user's body, preventing it from accurately tracking body movements.

Some users have reported that their Flex 2 stopped tracking their sleep after switching from the wristband to the necklace accessory. Fitbit recommends wearing the classic wristband during sleep and workouts to ensure accurate tracking.

It is important to note that the Flex 2 does not have a screen display, which may be a drawback for some users. Instead, it uses illuminated dots to show alerts and daily progress. Despite this limitation, the Flex 2 includes essential functions like step tracking, calorie counting, and tallying active minutes, making it a solid choice for those seeking a basic fitness tracker.

Sleep tracking data can be viewed on the Fitbit app

The Fitbit Flex 2 is a slim, water-resistant wristband that can track your sleep patterns. It is a discreet and comfortable device that can be worn to sleep. The Flex 2 estimates your sleep patterns by tracking your movement and heart rate. It assumes you are asleep when you haven't moved for about an hour and uses additional data, such as the length of time and type of movements, to confirm that you are asleep.

To manually start a sleep log on the Fitbit app, tap on the Sleep Tile, then on the plus sign in the top right corner, and select "Begin Sleep Now" when you go to bed. You can also edit or delete auto-detected sleep logs by tapping on the log and then on the ellipsis icon in the top right corner. This allows you to customize your sleep data as needed.

It is important to note that the Flex 2's sleep tracking accuracy may be affected if worn as a necklace or pendant instead of the classic wristband. The tracker needs to detect your body's movements throughout the night, and wearing it on a chain may result in reduced accuracy as it could be laying on the mattress instead. Therefore, it is recommended to wear the Flex 2 as a wristband during sleep to ensure optimal sleep tracking performance.

The Flex 2 can also monitor weight, diet, and fertility

The Flex 2 is a fitness tracker that can monitor not just your daily steps and mileage but also your sleep, weight, diet, and fertility. It is a sleek, slim, and comfortable device that can be worn on the wrist, making it ideal for continuous wear throughout the day and night. The Flex 2 is also water-resistant and can be submerged in up to 50 meters of water, making it suitable for tracking swims.

The Flex 2 estimates your sleep by tracking your movement and heart rate patterns. When you haven't moved for about an hour, the device assumes you're asleep. It also takes into account the length of time your movements are indicative of sleep behavior, such as rolling over. While you sleep, the Flex 2 tracks the beat-to-beat changes in your heart rate, known as heart rate variability (HRV), which fluctuates as you transition between light sleep, deep sleep, and REM sleep stages.

In addition to sleep tracking, the Flex 2 can monitor your weight by tracking weight gains and losses. It also encourages you to stay active by issuing hourly reminders to take steps toward your daily activity goals. The Flex 2 can be linked to a smartphone or computer, allowing you to easily monitor your calorie budgets, food and water intake, and overall diet.

The Flex 2 also includes features for women's health, such as fertility and menstruation tracking. By syncing your device with the accompanying smartphone app, you can access weekly, monthly, and annual data readouts for a comprehensive understanding of your health and fitness journey.

Frequently asked questions