Moonlight nightlight

Here's a good option for a subtle but effective nightlight: the moonlight lamp from JojoMamanBebe. Because, really, picking a nightlight is a struggle between it being bright enough to provide reassurance and visibility, and dim enough to allow sleep. If the effect of this one is to replicate real moonlight slanting through your windows, that's got to be good.

Added bonuses are that, unlike all those fancy animal lamps, it's extremely portable, plus, it's very cheap to run. I know it's not stunning lookswise, but at only £10, you can't really go wrong.