Patent ID: 8474727

Claim:
An air conditioner, comprising: an air-conditioning device that air-conditions an indoor space; an input device configured to receive signals for manipulating the air-conditioning device and a signal for selecting a sleep mode; and a controller that, when the input device receives the signal for selecting the sleep mode, controls the air-conditioning device to perform a rapid eye movement (REM) sleep operation at least one time to air-condition the indoor space at a temperature higher than a temperature set in accordance with the sleep mode, wherein the rapid eye movement (REM) sleep operation comprises: a first rapid eye movement (REM) sleep operation that is performed at least one time at an interval of a predetermined time during a process for performing the sleep mode; and a second rapid eye movement (REM) sleep operation that is performed at least one time at an interval of a predetermined time after the first rapid eye movement sleep operation is finished, and wherein the second rapid eye movement (REM) sleep operation is performed when a remaining sleep time at present is less than the first rapid eye movement (REM) sleep time.