From TomTom MySports,
If you are still experiencing problems, please contact us.
If you started using us prior to January 8, 2017, you will first need to re-authenticate against your TomTom MySports Cloud. To do so, you must first remove the authentication from TomTom MyCloud as described above. Once you reauthenticate, you will have to grant us the permissions to get your 24x7 activity tracking data and we’ll start reading it.
Unfortunately, Tomtom currently only provides us with the time you slept per day, not the granular information of when you slept or what kind of sleep you had.