Since I was a child such weird thoughts would always cross my mind leaving me scared or confused or both. I am sure most of us some time or the other doubt the reality of what we experience.
In one of the satsangs in the ashram Guruji spoke about dreams. (I would not be able to quote HIM verbatim). He said ,"Look at your whole past as a dream. At this moment dont you feel everything you have done and experienced in the past is like a dream? and whatever time you are going to be here, may be another 30 -40 years would also seem like a dream once you have lived through. Your whole life is nothing but a long dream. Whatever you are experiencing right now will seem like a dream just after a few moments. When you realise this you live every moment of your life with such great enthusiasm."
Someone rightly said "One who looks outside, dreams. One who looks inside, awakens!"