Power Outage

When my sister is in our room, making all the noise in the world, I stay asleep. Undisturbed. But when she leaves or enters the room, I wake up. When she wakes up, I wake up. When she steps out of the doorway to leave for school, I wake up. The sound of the door opening didn't wake me, I usually don't even hear it unless she's rushing and slams the door, but entering/leaving the room or leaving causes a disturbance so great that it wakes me.

This time, an excessive loss of radio waves woke me.