Firstly, it's important to understand the meaning of the phrase "asleep switch." It refers to the switch on electronic devices that causes them to enter a sleep mode, conserving energy when not in use. The antonyms for "asleep switch" would be those that specifically indicate that the device is awake and active. Some of these antonyms could be "on switch," "active mode," or "awake button." These phrases are used to indicate that the device is fully functional and in use, as opposed to being in the power-saving mode known as "asleep." Ultimately, using the right terminology can help ensure that there is no confusion when describing electronic devices and their functions.