Provided are a sleep awaking system and a sleep awaking method. The system comprises: a sign parameter collecting module for collecting a sign parameter of a human body； a time determining module for determining whether the present time is a REM determining time； a REM determining module for obtaining the sign parameter and determining whether the human body is in a REM stage according to the sign parameter in a REM determining period when the time determining module determines that the present time is the REM determining time； an awaking module for awaking the human body after a pre-awaking period when the REM determining module determines that the human body is in the REM stage and causing the human body to enter the REM stage within the pre-awaking period and awaking the human body after the pre-awaking period when the REM determining module determines that the human body is not in the REM stage, wherein the REM determining period and the pre-awaking period pass in turn from the REM determining time to the awaking time. The above system and method realize awaking the human body in the REM stage, making the human body feel a clear mind, act agilely, and full of spirit and energy after being awaked, which is good for health of the human body.
