Welcome to Nikonians! Congratulations on your new D5000 kit! When I am not using my camera I turn the power off. If you place the camera in a bag with the power on, the shutter release button can get pressed in some cases releasing the shutter, in all cases draining the battery. When the meter times out, the meter and VR turn off and the camera goes into standby mode. In standby mode the battery is being drained but by a very small amount. Of course over prolonged periods this can add up to a drained battery. Good Luck and Enjoy your Nikons!