An electric bed includes: a bed body, a plurality of bed planks, a wake-up device, a clock and a main control box. The main control box is electrically connected to the wake-up device and the clock, and is applicable for storing a wake-up time. The electric bed further includes a monitoring module. The monitoring module includes a processing module and a sensor, wherein the sensor is electrically connected to the processing module, and is applicable for monitoring whether a user has left the bed; if the sensor monitors that the user has not left the bed, the processing module activates the wake-up device when the wake-up time on the clock is due according to the stored wake-up time; and if the sensor monitors that the user has left the bed, the processing module does not activate the wake-up device when the wake-up time on the clock is due.