Guided meditations and audio should continue playing while your phone is locked.
- If you lock your phone the audio stops.
- While playing the phones light is on making sleeping difficult and draining the phones battery.
- This also means that you need to rise from a relaxed state at night after a meditation to switch your phone off - which is counter productive to the goal of getting to sleep.
Link to original discussion:
https://community.fitbit.com/t5/Fitbit-Premium-Coach/Guided-meditation-and-audio/m-p/4059814
Moderator edit: updated subject for clarity and label