Yourt camera autosenses the light available and holds the shutter open long enough to gather enough light. When it is dark out, the shutter stays open longer to gather more light, and the movement of you breathing is enough to make a blurry photo. Try putting the camera on a box or something if you don't have a tripod and use the "timer" mode. Press the button, step back and let the timer count down for 10 seconds or whatever it does and let the camera take the picture without you touching it. You won't get anymore blurry pics.