I have been researching about this and it looks like the term would be auditory arousal threshold. Imagine you fall asleep while listening to music with earbuds. Out of a sudden, the device starts playing really loud music (let´s say 40 dB higher compared to what you were listening). This sound would be quite loud that it would damage your ears. My question is, is there any study showing which would be the minimum dB level of a sound that would make you wake up (and, well, remove the earbuds)? I would assume this would depend on the frequency of the signals as well. But, what about the age of the person?
I think a SIREN sound with higher Decibel >110 will work. Because as a human being, a high pitch sound create alert signal to our brain. Still, the sound to wake up a person will vary from person to person. But a person will definitely react to eardrum piercing sound waves