I've heard my budgie Oliver making crunching noises at late at night. I initially thought that he probably woke up and was crunching his beak... But it sounded too much like his regurgitating noise. This morning when I uncovered his cage, I saw three or four seeds stuck to the bars so I knew he was regurgitating last night. It was very late so I believe he did it in his sleep. Is that normal? Do any of y'all's birds do that?