I believe what is happening here is that your thoughts are becoming symbolic. In the same way all the characters and situations you encounter in a dream are usually symbolic of something, these thoughts are verbal symbolism. The subconscious speaks in symbols. In a dream they are objects, people and situations; but if the conscious mind subsides before the dream begins, the symbols are thoughts.

For example, if you thought "I have to put out the tea kettle before it burns," it might be symbolic of some urgent real life situation you are worrying about which is about to come to a head.

I often lay in bed and watch these things for quite a long time. They're really bizarre.