My bird has been tired lately - he has a lot of pin feathers on his head (and lost a few larger feathers while playing recently) so I figure he's moulting (?). He has also just been preening constantly.
It seems like when he's not doing anything, he fluffs a bit and sits with his eyes open, moving very little, alternating legs.
Sometimes I'll let him out of his cage at these times and he'll fly around, sing, play with a mirror, or show affection to me on my shoulder. When he goes back to his cage, he'll continue this cheerful, playful mood for a while and then it's back to the fluff.
I've often read that a fluffed up, lethargic bird is sick. Could it be that he's just getting old (Approaching 9 years?) and this is how he is when he's bored? If it's quiet and I put on music he'll respond to it for a while, but he'll flip between having fun and just doing nothing in this puffy state.
Do budgies who are moulting tend to be like this? It seems like this molt has been going on for weeks/months now, is that relevant?