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sleep score (the quality of your sleep). Charge 4 also tracks your estimated oxygen
variation throughout the night to help you uncover potential breathing
disturbances. To see your sleep stats, sync your tracker when you wake up and
check the Fitbit app, or swipe up from the clock face on your tracker to check the
Sleep tile in Fitbit Today.
For more information, see help.fitbit.com.
Set a sleep goal
To start, you have a sleep goal of 8 hours of sleep per night. Customize this goal to
meet your needs.
For more information, see help.fitbit.com.
Learn about your sleep habits
With a Fitbit Premium subscription, see more details about your sleep score and
how you compare to your peers, which can help you build a better sleep routine
and wake up feeling refreshed.
For more information, see help.fitbit.com.
See your heart rate
Charge 4 tracks your heart rate throughout the day. Swipe up from the clock face to
see your real-time heart rate and your resting heart rate. For more information, see
"See your stats" on page31. Certain clock faces show your real-time heart rate on
the clock screen.
During a workout, Charge 4 shows your heart-rate zone and vibrates each time you
enter a different zone to help you target the training intensity of your choice.
For more information, see "Check your heart rate" on page38.
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