Andrew Huberman· PhD
Scents like peppermint, like these ammonia smelling salts, the reason they wake you up is because they trigger specific olfactory neurons that communicate with the specific centers of the brain, namely the amygdala and associated neurocircuitry and pathways that trigger alertness of the same sort that a cold shower or an ice bath, or a sudden surprise, or a stressful text message would evoke.