Too hot or something else?

It's been really hot today and it's way past time for the budgies to sleep. I normally cover them over but I'm worried about Nemo who is hunched sleeping but she's not puffy like when they normally sleep. Instead her feathers are quite tight on her body and she's been holding g her wings out. I assumed this meant she was hot (this was a few hours ago) and so only partially covered the cage and put a fan on low on them particularly Nemo but she hasn't seemed to cool down and now I'm worried if tight feathers and holding wings out a bit is a sign of something else? Or is she still just hot? Raz by comparison is puffed up with his head tucked back sleeping. So why hasn't Nemo puffed up for sleep too?

It has cooled down now (at least to me - and possibly Raz too lol) as it's night now which is why I'm a little worried she's still seemingly hot :S