How accurate is the Fitbit as a sleep tracker?

Doctors wary of patients' sleep data from activity trackers due to a lack of validation, say study authors
Fitbit sleep

When a patient comes in with sleep times recorded on a Fitbit, doctors can now assume the device provides useful data, researchers say.

One model of the Fitbit activity tracker is as accurate in monitoring sleep patterns as the more expensive research-grade actigraphs, write the Monash University study authors.