I had a bad dream about being held down by an evil force. I instinctively knew it was trying to get inside me. I know that sounds silly. I won’t go into detail, but it was terrifying. Upon awakening I noticed a strong stench of sulfur. Does the smell mean anything? Assuming that it had no mundane cause since my drains smell fine and there are no gas lines in my house. Is it common to have olfactory hallucinations like this while dreaming or immediately after dreaming?