ANSWER:

This depends on the meaning of it as it may mean the feelings, thoughts and past experiences of an individual that influence his choices and may even affect his dreams.  This is normal and it doesn’t go against islam. 

But if one uses it to be a way to know the hidden things and to use it in a philosophical term, then it is totally prohibited and may ruin one’s belief.

Shiekh I always believed there is no subconscious mind. We have one mind. And Shaytan puts bad thoughts in our mind which we have to fight with the Quran and Sunnah. However, my Muslim friends say that there is a subconscious mind and that belief should come from there. I am confused. Should I ignore this talk or does Islam say something about the subconscious mind?