Does anyone use one of these? I think it's a fantastic product. For anyone that hadn't heard of it you attach it to your main light before you put the bulb in. When you switch the light on at the wall it comes on as a nightlight so you can see the whole room with a blue dim light that won't wake baby. If you switch it off and on again the normal light comes on. This week ours has stopped working properly. The nightlight part doesn't come on but the full light does. Im assuming this means it's not a problem with the bulb. Anyone got any ideas on what might be wrong with it?