To select and play appropriate music according to the arousal level of the user to modulate their arousal level in order to facilitate sleep and to promote morning alertness.

• 根据清醒程度与情境，自动选择与播放合适的音乐来调整使用者的清醒程度，帮助他在更快更安稳的睡著或在更迅速的清醒。