1) Comfort for a nyctophobe 2) Light fixture 3) Nursery glower 4) Small bulb in the bedroom 
A nightlight is a small light fixture, often electrical, placed for comfort or convenience in dark areas or areas that may become dark at certain times, such as in an emergency. Small long-burning candles serving a similar function are referred to as tealights. == Use and culture == People often use nightlights for the sense of security which havi...
[n] - light (as a candle or small bulb) that burns in a bedroom at night (as for children or invalids)
A faint light that can be left on all night to help a baby or small child sleep.