A sleep state detection method applicable to a smart wearable device and a terminal bound to the smart wearable device, the method comprising the steps of: upon detecting, by the smart wearable device, that a current state of a user satisfies a preset sleep condition, sending a state checking request to the terminal; receiving (S501, S801), by the terminal, the state checking request; checking, by the terminal, an operation event of a preset application on the terminal according to the state checking request; feeding, by the terminal, state information back to the smart wearable device based on a result of the checking; receiving, by the smart wearable device, the state information; determining (S201, S202), by the smart wearable device, whether the user enters a sleep state, based on the state information; when it is determined, by the smart wearable device, that the user enters the sleep state, sending a notification to the terminal notifying that the user enters the sleep state; and receiving, by the terminal, the notification sent by the smart wearable device, and closing the preset application according to the notification; wherein a current state of the preset application comprises an awake state or a non-awake state, and the checking the operation event of the preset application on the terminal comprises: outputting a prompt for closing the preset application on the terminal; when a feedback command performed by the user corresponding to the prompt is received by the terminal within a preset time period, determining that the current state of the preset application is the awake state; when no feedback command performed by the user corresponding to the prompt is received by the terminal within the preset time period, determining that the current state of the preset application is the non-awake state. upon detecting, by the smart wearable device, that a current state of a user satisfies a preset sleep condition, sending a state checking request to the terminal; receiving (S501, S801), by the terminal, the state checking request; checking, by the terminal, an operation event of a preset application on the terminal according to the state checking request; feeding, by the terminal, state information back to the smart wearable device based on a result of the checking; receiving, by the smart wearable device, the state information; determining (S201, S202), by the smart wearable device, whether the user enters a sleep state, based on the state information; when it is determined, by the smart wearable device, that the user enters the sleep state, sending a notification to the terminal notifying that the user enters the sleep state; and receiving, by the terminal, the notification sent by the smart wearable device, and closing the preset application according to the notification; wherein a current state of the preset application comprises an awake state or a non-awake state, and the checking the operation event of the preset application on the terminal comprises: outputting a prompt for closing the preset application on the terminal; when a feedback command performed by the user corresponding to the prompt is received by the terminal within a preset time period, determining that the current state of the preset application is the awake state; when no feedback command performed by the user corresponding to the prompt is received by the terminal within the preset time period, determining that the current state of the preset application is the non-awake state. outputting a prompt for closing the preset application on the terminal; when a feedback command performed by the user corresponding to the prompt is received by the terminal within a preset time period, determining that the current state of the preset application is the awake state; when no feedback command performed by the user corresponding to the prompt is received by the terminal within the preset time period, determining that the current state of the preset application is the non-awake state.