Soo, there are things that really do tell you that your dreaming. Here is some things:
Something is not right
Weird things happen. A person might turn into a ghost, or somebody that you don't know might know your name. Something is weird, and something is not right, but wrong. But your not sure of it. This proves your dreaming.
2. The second thing is : Signs that come out in dreams.
There are signs in every dream you might not notice. This may come out in most of the dreams. It might be a cat, of a bird. My friends dream always have one minion in it(At least).I have flight. Which means a certain movement might prove its a dream.
3. No sense
You don't feel the five senses. You can hear and see, but no other. The other 3 senses will not come out. Which are: touch, smell, and taste. None of it would be in a dream cause its a dream.
Like this, there are many things that prove your dreaming, and its all an illusion.
(Well, number 2 may not come out, but usually 1 and 3 comes out.
After I read this, I thought about it and this cannot be true... What if the thing I thought that it was a dream is true???? Like in many fantasy novels...