(S)he might be trying to tell you something.. Chuckie has distinct chirps depending on what he wants - attention, fresh water, fresh food, to come out of the cage, to turn the lights on/off, or new newspaper at the bottom of the cage... Have you tried taking Screech out of the cage to see if (s)he stops? (S)he might just want some attention or some stretch space to wake up or wind down before bedtime.
PS - your birds are beautiful!
I don't know what the best
fruits & veggies are for birds, but fruits & veggies Chuckie eats are: spinach, broccoli, celery (the vet said don't give them much since it's got no real nutritional value), yams, strawberries, papaya, blueberries.. He's a picky eater, but he'll almost always eat these when they're offered.