My DD (2 and 3 months) has just started waking up in the night and being difficult to settle after almost a year of solid sleeping through.
Last night she was crying at 1.15am and I went in to settle her and then left her door open a chink and the landing light on and she was fine.
There have been other indications that she is getting adverse to the dark - is fear/uneasiness in the dark normal at this age?