If you'd like to fall asleep while using the Controller and Speaker then simply press the Sleep button one time. This will put it into Sleep Mode.Once it's activated, the controller will continue to play music for about 30 minutes.During the last 5 minutes of the sleep timeout, the controller will begin to decrease the volume so that as it shuts off, the volume is about 25% of what you had been listening to.At that point, the controller will power off until you power it back on manually.To end the Sleep Mode without turning off the controller, simply press the Sleep button again and it will return to normal operation.