Why is a power supply connection required to my phone during sleep recordings?

Briefly summarizes power supply connectivity requirements

The DROWZLE application requires a minimum of six hours of recorded sleep breathing, and recommends a full overnight recording.

During the recording, the application will be in use and communicating sleep breathing data to our cloud-based system. This consistent usage of the application will draw power from the phone battery, and may deplete it during the evening. To prevent the application from shutting down due to a low battery status, the application requires a connection to a power supply during the recording.