Pixie has a burst of energy first thing in the morning, then she will quieten down just before i go off to work as she knows this is the quiet time in the house. she will liven up again when i arrive home, sleep on and off some of the afternoon and then is lively & playful most of the evening till about 10pm when she starts getting ready for bed, it's all about routine with her.
Its probably nothing to worry about but get her checked just in case