sleeping all day

Hello! My cockatiel is 8 months old and very active during the day. Yesterday, however, I noticed she slept the majority of the day but is back to her normal self today. Should I be worried? Forgive my punctuation.

Hi guys! So cocoa has been acting very weird today, he keeps sleeping. He is usually so energetic, i am hoping he is just tired and has not gotten any sleep last night. But he has not been eating his usual foods. i don’t know if he needs to see urgent care or not but regardless i am a worrier so...