Yes, unlike traditional oil burners that use a naked flame and alter the composition of essential oils, the Aroma Snooze is a cool mist ultrasonic diffuser which is completely safe to leave unattended, and to use around babies, children, and pets.When the minimal water level is reached, the Aroma Snooze will automatically switch off. We actively encourage customers to sleep with their Aroma Snooze on to reap the benefits of essential oils, and benefit from the clean air or leave it running if they’re leaving home to return to beautifully purified air and an uplifting aroma.