1. Basic (2-Stage) Sleep Analysis

The Essential (2-Stage) Sleep Analysis feature allows you to review the following sleep data:

Data Name	Definition
`sleep_stages`	A list of numbers, indicating sleep stages during time_in_bed (0: Wake / 1: Sleep)
`start_time`	Exact time at which the tracking started
`end_time`	Exact time at which the tracking ended.
`time_in_bed`	The time duration between the start and the end of tracking
`sleep_time`	Exact time at which ‘Sleep’ was first detected since the tracking started
`wake_time`	Exact time at which the last 'Wake' period was detected during tracking. No sleep will be detected after wake_time
`time_in_sleep_period`	The time duration between the onset of ‘Sleep’ and the start of the last ‘Wake’ during tracking
`sleep_latency`	The time duration between the start of tracking and the detection of first 'Sleep'
`wakeup_latency`	The time duration between the start of the last 'Wake' and the end of tracking
`time_in_sleep`	The actual time spent sleeping. It is the time duration calculated after subtracting all ‘Wake’ time from time_in_bed
`sleep_efficiency`	The ratio of time_in_sleep to time_in_bed
`waso_count`	The number of ‘Wake’ detected during time_in_sleep_period
`longest_waso`	The longest time duration of ‘Wake’ during time_in_sleep_period
`time_in_wake`	The sum of all ‘Wake’ seconds detected during time_in_sleep_period
`sleep_ratio`	Ratio of time_in_sleep to time_in_sleep_period
`wake_ratio`	Ratio of time_in_wake to time_in_sleep_period
`sleep_index`	The metric that comprehensively represents sleep quality, defined by learning from the distribution of sleep data

2. 4 Sleep Stages Analysis

The Advanced (4-Stage) Sleep Analysis feature allows you to additionally review the following sleep data in addition to the basic (2-Stage) sleep analysis data:

Data Name	Definition
`sleep_stages`	A list of numbers, indicating sleep stages during time_in_bed (0: Wake / 1: Light / 2: Deep / 3: REM)
`time_in_light`	The sum of all ‘Light’ seconds detected during time_in_sleep_period
`time_in_deep`	The sum of all ‘Deep’ seconds detected during time_in_sleep_period
`time_in_rem`	The sum of all ‘REM’ seconds detected during time_in_sleep_period
`light_ratio`	Ratio of time_in_light to time_in_sleep_period
`deep_ratio`	Ratio of time_in_deep to time_in_sleep_period
`rem_ratio`	Ratio of time_in_rem to time_in_sleep_period
`light_latency`	The time duration between sleep_time to the first detection of ‘Light’ (Normally, '0' as light sleep is the first sleep stage to be detected)
`deep_latency`	The time duration between sleep_time to the first detection of ‘Deep’
`rem_latency`	The time duration between sleep_time to the first detection of ‘REM’
`sleep_cycle`	The average time duration of sleep cycles. Each sleep cycle is consisted of both 'REM' and 'Non-REM' sleep.
`sleep_cycle_count`	The number of sleep cycles detected during the time_in_sleep_period
`sleep_cycle_time`	A list of the exact start and end times of each sleep cycle

3. Breathing Analysis

The Respiratory Instability Analysis feature allows you to review the following sleep data:

Data Name	Definition
`breath_stages`	A list of breath stages during the time_in_bed (0: Stable / 1: Unstable)
`time_in_unstable_breath`	The time duration, of which unstable breath is detected during time_in_sleep_period
`time_in_stable_breath`	The time duration, of which stable breath is detected during time_in_sleep_period
`unstable_breath_ratio`	The ratio of time_in_unstable_breath to time_in_sleep_period
`stable_breath_ratio`	The of time_in_stable_breath to time_in_sleep_period
`breathing_index`	The numbers indicating the level of breathing instability
`breathing_pattern`	A list of names indicating the level of breathing instability: 'Stable', 'Slightly Unstable', 'Unstable', 'Severely Unstable’
`unstable_breath_count`	The number of times unstable breath is detected during the time_in_sleep_period

4. Real-time Sleep Analysis

By utilizing the Real-time Sleep Analysis feature, you can monitor the following data in real-time:

Data Name	Definition
`sleep_stages`	A list of numbers, indicating sleep stages during time_in_bed
`breath_stages`	A list of breath stages during the time_in_bed (0: Stable / 1: Unstable)