Dreams during the day gives you hope.
You dream to aspire
You dream to success
You dream to desire
Dreams during night gives you false hope and regrets
You dream about things you can never have
You dream about the person you can't be with
You dream about past that you just want to forget about
Yet we tell our friends and loved ones
"Sweet dreams"
Because that is the only thing you can do to give them hope that when you wake up, it's only a dream.