Merrily, Merrily, Merrily, Merrily, life is but a dream

I use to feel like this a lot too, especially after reading on things like Astral Projection, DMT and somewhere along reading something about "life is a dream within a dream". I had this thought that what if this is all a dream and I am going to just wake up one day, what if my daydreams are my real life, what if life after death is life... and then I just told myself to relax and just live.