There are products that alert people with hearing loss for a variety of reasons; including fire alarm, telephone, doorbell, baby cry, etc. That is done with vibrations, strobe lights, and loud sound. For many of us with profound hearing loss, the loud sound doesn't help much when you have your hearing technology off when you're sleeping. A lot depends on your personal situation. You may want to check Diglo.com The provide a catalog that contains a huge variety of assistive technology, including alerting devices.