Tookie, my plum headed parakeet, has been chirping softly to himself, while he is asleep. At least he is in position to sleep, head turned, and tucked behind his wing. If all is quiet, and I stop to listen, it happens in what is similar to human dreams. It will go on for about 10 to 20 seconds, stop, and start again for the same amount of time.
It really is sooo very sweet, if it is a dream, it sounds like a good one.
Does anyone have any similar experiences with their birds?