Patent US10417901

a first sensor for generating a movement signal corresponding to a user movement;

a second sensor configured to physically contact a user to generate a photoplethysmography (PPG) signal, the second sensor comprising: a light emitter for emitting light for generating the PPG signal, and a light receiver for receiving light reflected from the user;

a communicator; and

a processor configured to: set a plurality of preset time periods which are consecutive time periods for analyzing a sleep of the user, each of the plurality of preset time periods being a predetermined amount of time to determine one sleeping state of the user, set a first part of the predetermined amount of time in each of the plurality of preset time periods to emit the light, and set a remaining part of the predetermined amount of time in each of the plurality of preset time periods to not emit the light, control the light emitter to emit the light in the first part of a first time period of the plurality of preset time periods and to not emit the light in the remaining part of the first time period, determine, for the first time period, the one sleeping state of the user as a first sleeping state, based on the movement signal and the PPG signal that are generated for the first time period, control the light emitter to emit the light in the first part of a second time period of the plurality of preset time periods and to not emit the light in the remaining part of the second time period, determine, for the second time period, the one sleeping state of the user as a second sleeping state, based on the movement signal and the PPG signal that are generated for the second time period, and control the communicator to transmit a control command corresponding to at least one from among the first sleeping state and the second sleeping state to another electronic device to cause the another electronic device to operate in correspondence with the at least one from among the first sleeping state and the second sleeping state, of the user.

setting a plurality of preset time periods which are consecutive time periods for analyzing a sleep of a user, each of the plurality of preset time periods being a predetermined amount of time to determine one sleeping state of the user;

generating a movement signal based on a user movement, by a first sensor of an electronic device; and

generating a photoplethysmography (PPG) signal by a second sensor of the electronic device that emits light for generating the PPG signal while physically contacting the user,

the method further comprising: setting a first part of the predetermined amount of time in each of the plurality of preset time periods to emit the light, and setting a remaining part of the predetermined amount of time in each of the plurality of preset time periods to not emit the light, controlling a light emitter of the second sensor to emit the light in the first part of each of a first time period of the plurality of preset time periods and to not emit the light in the remaining part of the first time period, and receiving, by a light receiver of the second sensor, light reflected from the user, determining, for the first time period, the one sleeping state of the user as a first sleeping state, based on the movement signal and the PPG signal that are generated for the first time period, controlling the light emitter to emit the light in the first part of a second time period of the plurality of preset time periods and to not emit the light in the remaining part of the second time period, and receiving, by the light receiver, the light reflected from the user, determining, for the second time period, the one sleeping state of the user as a second sleeping state, based on the movement signal and the PPG signal that are generated for the second time period, and transmitting a control command corresponding to at least one from among the first sleeping state and the second sleeping state to another electronic device to cause the another electronic device to operate in correspondence with the at least one from among the first sleeping state and the second sleeping state, of the user.