Apparently smoke alarms are less effective in waking kids. Some models have voice alarms in addition to the irritating beeps. I think there is one coming or maybe available that can record the wake up (Insert name of person) there is a fire message in your own voice which is much more effective at waking kids. I know my sister (not a kid) could probably sleep through and earthquake accompanied with a flood and explosions. She wakes for the alarm clock however.
