How do you know you are not dreaming?
Bizarre things happen in dreams: You fly or conjure an all–you– can–eat dessert buffet out of thin air, or get chased by witches through the halls of your elementary school ,which suddenly looks a lot like Paris.
But the strange things that happen in dreams don't seem strange at the time. So how do you know you are not in a dream right now that will seem very strange after you wake up?
Well, it is possible to notice the strangeness of a dream while you are dreaming.
Lucid dreamers know they are dreaming. By definition, if you were having a lucid dream, you would know it.
But all that proves is that you are not having a lucid dream.It doesn't prove you are awake.
There has to be a surefire test–– something that never–or only– happens when you are awake, something that never–or only– happens in a dream.