Dreams do tend to follow certain patterns.
For example pregnant women have nightmares about their future babies. Everyone gets chased sometimes, and it is apparently quite common to have flying dreams in which one has difficulty avoiding overhead power lines. What is not dreamed about may be as significant as what is dreamed about. We observe that certain topics and certain styles of dream occur more frequently than others. It is true that I have done some bird-spotting in the past including a seven week bout in Australia not too long ago.