We do not recommend, under any circumstances to run a heater unattended. Heaters draw quite a bit of electricity and can reach high temperatures while running. Therefore a heater should always be ran in a manner in which is can be attended to. They should not be left running while asleep and should never be left in a Childs room while they sleep, unattended. This is to ensure safe functionality of the heater and the safety of our consumers. If you have any questions regarding this, our Customer Support Specialists would be happy to help.