I have 4 budgies. Sunshine(female) fluffy(male) Jae(female)pinchy (possibly male). During the day they all play together and everything seems fine, however sometimes it seems like they don't play with pinchy as much... or maybe pinchy doesn't play with them as much, but at night, pinchy sleeps on a different perch, while the others sleep together, I don't understand this because it seems like they usually all get along. Is there budgie bullying going on? Is this normal?