Abstract: A determination system includes an obtainer, a determiner, and an outputter. The obtainer obtains a result of detection by a first sensor which detects a body movement of a body part of a user exposed from a covering, and a result of detection by a second sensor which detects a body movement of the user. The determiner determines a sleep state of the user, based on the result of detection by the first sensor and the result of detection by the second sensor, which are obtained by the obtainer, the sleep state including a state of the covering. The outputter outputs information based on a result of determination by the determiner.

Abstract: Weight information is determined for each of an individual evaluation criterion that is determined on the basis of a sleep log that includes a log of specific sleep information relating to the sleep of a specific user and a general evaluation criterion that is determined on the basis of sleep information relating to the sleep of a plurality of users; and an evaluation process is performed, which is a process of evaluating the sleep of the specific user from the specific sleep information, using the individual evaluation criterion, the general evaluation criterion, and the weight information.

Abstract: The control method according to one aspect of the present disclosure is a method of controlling an apparatus which adjusts a bed ambient temperature for a user, the method including obtaining one of measurement information in a sensor and setting information of the apparatus; estimating the bed ambient temperature and one of getting in bed, starting of sleep, and falling asleep by the user, based on the one of the measurement information and the setting information; and when a first temperature is the bed ambient temperature before the user gets into bed, starts sleeping, or falls asleep, changing the bed ambient temperature to a second temperature, which is lower than the first temperature by 0.5° C. or more, in a period after the user gets into bed, starts sleeping, or falls asleep and before a non-shallow sleep state of the user ends.