Dreams are in your mind, right?

So can you think while your in a dream? If you can't... with this logic... then through the day saying mentally, "Am I dreaming... or I'm dreaming.." won't help, because in a dream you verbally speak everything...

Does this make sense?

Let me try to explain this better(consider this view point):

While you are dreaming you cannot "think" because you are already thinking, e.g. creating the dream world. Although you cannot think to yourself in your dream, you can speak in your dream. Meaning that reality and the dream world have this in common. Thus when you are trying to convince yourself of something you should speak it verbally, instead of mentally. Something spoken verbally has more power then something that you just think. And through speaking verbally, you will then be able to speak it in your dreams.

e.g. Thinking, or speaking mentally, will not be replicated in your dream because you cannot think while you are already thinking.

Now this is just a hypothetical opinion

Any thoughts?