Biosensor, sleep information processing method and apparatus, computer program thereof and computer readable storage medium thereof

A biosensor senses pulse wave data of a user. The biosensor stores relation information, which indicates a relationship between recommended bedtime data and sleep-affecting activity data. The relationship between the recommended bedtime data and the sleep-affecting activity data is determined in view of at least one of previously sensed pulse wave data of the user and model pulse wave data. The biosensor receives at least one sleep-affecting activity value from the user. The biosensor computes recommended bedtime information based on the at least one sleep-affecting activity value in view of the relation information. The biosensor gives notification to the user based on the recommended bedtime information.