It's all about our psyche! Even if you think about breathing for a few seconds, then at some point suffocation begins, and then the fear of losing breath, which, as a result, for people with a weak psyche - fainting or the emergence of a stereotype.
As a child, I was afraid that after falling asleep I would stop breathing. You can also think about how the leg and hand move from thought) This is interesting. You can think of problems))
Attention can have a number of negative effects. For example, de-automation is the destruction of previously automated activity when paying attention to its individual components. The outstanding Russian physiologist Nikolai Aleksandrovich Bernstein, as an example of de-automation, cites the parable of the centipede, which the malevolent toad turned to and asked which leg it starts to walk with. Lost in thought, the centipede could not take a single step. Try to carefully monitor how you manage to hit the desired keys when you type on the keyboard of a personal computer. The de-automation effect will not be long in coming. Even the time of a simple motor reaction in response to the appearance of a previously known stimulus, as opposed to the "accelerating" effect of attention, according to W. James, increases if a person pays attention to the movement being performed itself, and not to the stimulus that should cause it.