First mentioned in the song "You Get What You Give" by the band New Radicals. It is a disease common among young people. Symptoms include: perseverance, optimism, self-belief, staying true to yourself, going for your dreams, enjoying your life, not caring what people think, and believing that if you give you will be rewarded.
Danny: Why is he being so optimistic, he has so much to do and has nothing to be happy about?

Greg: It's because he's got Dreamer's Disease.
by PixieStyxx March 2, 2017
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Waking up several times in a dream world before actually waking up.
This morning I woke up and couldn't tell if I was in a dream world or the real world. I think I have a dreamer's disease.
by Douryn August 2, 2021
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