How does fitbit flex set up sleep?

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1 First of all, you know what the normal mode is. When you double-click Fitbit Flex, you will see the led lights flashing (once for each light from left to right), and then N led lights flashing at the same time. These N LEDs represent the sports goals you have achieved today. The default value is 10000 steps per day, and each LED lamp represents 20% (i.e. 1 lamp represents 0 step of the day).

2. Enter the sleep mode, tap Fitbit flex several times (I usually need five times when standing, but sometimes I feel bad when lying down, so I need to tap more times), until the flex vibrates, and the led lights on it will display two (it seems to be the leftmost and rightmost). At this time, I entered the sleep mode. In this mode, double-clicking flex will display two LEDs, shaking left and right (14 lights, and 25 lights will light alternately).

3. Exit sleep mode. Similarly, if you tap Fitbit flex several times, the flex will vibrate, and at the same time, the led will completely flash, indicating that you have quit sleep mode.

In addition, I read on the Internet that entering exercise mode is similar to this one, and it is estimated that I will do strenuous exercise after entering sleep mode, but I have not studied it.