What colour are the walls in the room?
Do you have a nightlight? Dimmer switch?
With my 2.5 yo daughter we've had to dim the lights to about 25% brightness so that she'll sleep at night. Otherwise she keeps getting out of bed to tell us it's too dark. If we dim the lights she'll go to sleep just fine, but we have to keep it dimmed or else she'll wake up in the middle of the night and cry about the room being too dark. Oh well, it's not too much of a drain on the energy bill, and at least we get a good night's sleep.
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