Huh... that's really strange... I would contact your local avian vet and ask for some advice over the phone, and maybe make an appointment... It could be nothing, or it could be a neurological issue, where she falls into too deep a sleep and won't wake up easily?
I know people do that... namely my Dad
He goes through a phase most nights where NOTHING will wake him up for an hour or two, other than pain... don't ask how we know that one :wink:
I know people do that... namely my Dad