Moments are very potent. When you decide that you will do a thing or not do it actually, you really do not know the actual outcome. As the moment comes, your plan changes, and you end up doing a thing that you decided you would definitely not do.
Who instills a thought in you any way? Does a thought come just like that? Or is it another universe, a reflection of which is "your world": what happens there is mirrored here in "this world".
There is no other explanation, however much you think about your metabolism, however much you think about your neurons.