Please note first that manually entered values are ignored by INGO.

Apple Health

You don’t need a wearable for sleep tracking, your iPhone is enough.
Make sure to give INGO access to your sleep information from Apple Health if you haven’t done that already. For more info on how to do that tap here.
To track your sleep on iOS, make sure that you set up sleep schedules first. For more info on how to create a sleep schedule on iOS tap here.
Sleep hours are calculated for the day you wake up on. In other terms when you sleep on a Tuesday night and wake up on a Wednesday, the time slept is calculated for Wednesday.
Sleep hour calculation is not cumulative; INGO will only consider your lengthiest consecutive hours in bed. Say you slept for 6 straight hours at night, then took a nap in the afternoon; we will only regard the 6 hours of sleep and disregard the nap time.

Fitbit

Fitbit application must be installed in order to sync your Fitbit wearable with your device.
Sleep activity is tracked using your Fitbit wearable only, which must be worn during sleep.
Sleep detection can be configured to "Normal" or "Sensitive" in your Fitbit account settings.
Sleep hours are calculated for the day you wake up on. In other terms when you sleep on a Tuesday night and wake up on a Wednesday, the time slept is calculated for Wednesday.
Sleep hour calculation is not cumulative; INGO will only consider your lengthiest consecutive hours in bed. Say you slept for 6 straight hours at night, then took a nap in the afternoon; we will only regard the 6 hours of sleep and disregard the nap time.
Make sure your sleep activity is synced with the Fitbit application before syncing with INGO.

Garmin Connect application must be installed in order to sync your Garmin wearable with your device.
Sleep activity is tracked using your Garmin wearable only, which must be worn during sleep.
INGO does not track sleep logs that were manually logged by you. It only tracks sleep activity that was automatically logged by Garmin wearables during sleep.
Sleep hours are calculated for the day you wake up on. In other terms when you sleep on a Tuesday night and wake up on a Wednesday, the time slept is calculated for Wednesday.
Sleep hour calculation is not cumulative; INGO will only consider your lengthiest consecutive hours in bed. Say you slept for 6 straight hours at night, then took a nap in the afternoon; we will only regard the 6 hours of sleep and disregard the nap time.
Make sure your sleep activity is synced with the Garmin Connect application before syncing with INGO.

Huawei Health application must be installed in order to sync your Huawei Health compatible wearable with your device.
Sleep activity is tracked using your Huawei Health wearable only, which must be worn during sleep.
INGO does not track sleep logs that were manually logged by you. It only tracks sleep activity that was automatically logged by Huawei Health compatible wearables during sleep.
Sleep hours are calculated for the day you wake up on. In other terms when you sleep on a Tuesday night and wake up on a Wednesday, the time slept is calculated for Wednesday.
Sleep hour calculation is not cumulative; INGO will only consider your lengthiest consecutive hours in bed. Say you slept for 6 straight hours at night, then took a nap in the afternoon; we will only regard the 6 hours of sleep and disregard the nap time.
To track your sleep TruSleep™ must be on. Open the Huawei Health app, touch Devices then your device name, go to Health monitoring > HUAWEI TruSleep™, and enable HUAWEI TruSleep™.
Make sure your sleep activity is synced with the Huawei Health application before syncing with INGO.