Yes. But not in the literal way that a lot of people seem to be taking this. Everyone thinks constantly, I think we all know that. But I do, however , have trouble with certain conscious thoughts...going on and on. I cried about it once when I was about 6. I was so tired...it was around 3AM and there happened to be a light on in the kitchen. My grandfather was in there reading a paper and I just ran in there and cried, asking him how you make the voice in your head be quiet. He gave me a strange look and asked me what I meant. I told him that I could never sleep because the stupid voice in my head (always my voice) kept talking about letters and numbers and dinosaurs and "does everyone see colours the same way? if i looked through another person's eyes with my mind, would i see yellow through their eyes, when my eyese would see blue? do we only call it yellow or blue because that is what we are taught in school, but really one person's yellow could be another person's blue if they looked at it the way the other person looked at it" or "does everyone taste things the same way to all people? what makes some people like certain tastes and dislike others? why doesn't everyone like and hate everything the same way? is it something in our brains or do our tongues taste completely different things?", etc etc. All day and all night. It is a wonder that I can do anything for all of the daydreaming i do and how often I am "lost in thought". The constant thinking has never stopped and I still don't get enough sleep.
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I think I know. I don't think I know. I don't think I think I know. I don't think I think.