A device for rocking a hammock holding a human is described. The device includes a frame, a lever arm, a solenoid, a cord, and a signaling device. The lever arm pivots about a pivot point to move within the frame. The solenoid is connected to the lever arm to apply a force to rotate the lever arm. The lever arm is connected via the cord to the hammock. As the lever arm moves from one position to another within the frame, the signaling device detects the position of the lever arm and signals to turn on the solenoid to apply a force to the lever arm to rock the hammock.