Dusk-to-Dawn LED Night Lights, 6-Pack
Plug one into every room you stumble through at night and forget about them — a light sensor switches them on at dusk and off at dawn. Six of them cost less than one designer lamp and use about 2 kWh a year.

You get four of these for one low price, so you can put one in every room that needs a little light at 2am without thinking twice about cost. The sensor turns it on when it gets dark and off when it doesn't, so nobody has to remember to flip a switch.
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Lighting hallways, stairs, and bathrooms for middle-of-the-night trips
This is a plain plug-in light, not a soother or sound machine, so it won't help with sleep training, but it's compact enough that it won't block the other outlet.
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