KML, when I get overtired, I get wound up sometimes. I can relate. And it stinks. The doctor said to find a time between 7 and 9:30 (b/c one was too early and one was too late) and that timing seems to work perfectly for her.
She is definitely prone to overtired.
She definitely gets enough exercise - she's out of the house by 10 each day doing an activity - art, story time, gym class, music, singalong, etc. and then in the afternoon she goes to the park and runs around. She walks and plays outside.
At this point, it feels to me like separation anxiety; it only happens on the night exBF isn't here. Every single time. I tried sleeping in another room last night and put a monitor in the room for her (so I could hear her) and she woke at 12:30 shrieking MOMMY!!!!!!! and then I tried to get her back down in her bed, and she was awake (tossing and turning and then just lying there with her eyes open) for an hour before I very very very reluctnatly brought her into bed with me at 2 am. She did the same (tossed, turned, and laid with her eyes open.) Until 6 when she finally passed out.