The device is very likely to overheat and be damaged, or even cause a fire.

That's what I was afraid of. Okay. Thanks for your help.

If space allows, there are some fairly small candelabra base compact flourescent light bulbs available. smallest I've seen are 5 watts. These will give you far more light than a 5 or 7 watt incandescent bulb usualy used in night lights. These should be safe as far as heat generation.

That depends. If it is a sensor nightlight, you must stick with incandescent. If it is a switch, you can use a cfl or led. Do not exceed 7w.

Smithy, please stop bumping these old posts. This one is almost 4 months old, and was already answered adequately!