Collier E, et al. - Twenty-one enuretic children and 18 controls, aged 6 to 12 years old, slept with a wearable sleep tracker device, a Fitbit Charge 2, for 14 consecutive days in order to examine the disparity in sleep parameters and heart rate variability (HRV) between enuretic and control children in their home setting by using a wearable sleep tracker during a long observation period. Using a wrist-worn sleep tracker device Fitbit Charge 2, in the normal home environment exhibited that in comparison with non-bedwetting children, enuretic children have a greater difference in their rapid eye movement sleep and sleepless effectively during a wet night.