Many people will have the experience to fall asleep on buses or trains. Although they have sleep enough before hand, but when they are shaken on the buses or trains, they will fall asleep and snore again. This is because the frequency of snore and the frequency of the shaking of buses. However, the frequencies of snore are different people by people, therefore, other people's snore may not make you fall asleep. Therefore, we should record our snore first. Before we go to sleep, we play the snore we have recorded before. Listening to our own snore, we will fall into sleep eventually.