  Sleep has a significant role to maintain our health. However, people have
struggled with sleep induction because of noise, emotion, and complicated
thoughts. We hypothesized that there was more effective auditory stimulation to
induce sleep based on their mental states. We investigated five auditory
stimulation: sham, repetitive beep, binaural beat, white noise, and rainy
sounds. The Pittsburgh sleep quality index was performed to divide subjects
into good and poor sleep groups. To verify the subject's mental states between
initiation of sessions, a psychomotor vigilance task and Stanford sleepiness
scale (SSS) were performed before auditory stimulation. After auditory
stimulation, we asked subjects to report their sleep experience during auditory
stimulation. We also calculated alpha dominant duration that was the period
that represents the wake period during stimulation. We showed that there were
no differences in reaction time and SSS between sessions. It indicated sleep
experience is not related to the timeline. The good sleep group fell asleep
more frequently than the poor sleep group when they hear white noise and rainy
sounds. Moreover, when subjects failed to fall asleep during sham, most
subjects fell asleep during rainy sound (Cohen's kappa: -0.588). These results
help people to select suitable auditory stimulation to induce sleep based on
their mental states.
