one of the hardest things for young mothers is that we think we know our babies, but babies change quickly and frequently. a 'good sleeper' or a 'good eater' or a baby who isn't clingy can whip that around literally overnight.
it's just a different phase. a frustrating one, granted.
i'm right there with the advice to keep your night visits to her as short as possible, as dark as possible, and very very quiet. if she's playing quietly, leave her alone. you can't make anyone sleep. she'll figure out soon enough that nighttime is sleep time, but NO one sleeps well every single night. make sure you don't allow nighttime to turn into mom-and-play time, and hold onto your hat for the next switcheroo that's coming down the pike!
khairete
S.