Think of someone whose eyes are on a picture that is not in the room. At night that picture arrives by itself and we call it a dream. In the daytime the person makes the picture on purpose, and it is a plan for a life that has not happened. Dreamer names the person in both cases: the one who is somewhere else, looking at something the rest of us cannot see.
From the word’s history
Wiktionary derives dreamer from Middle English dremer, dream + -er, with cognates in Dutch dromer and German Träumer. The word starts from the plain 'one who dreams'; the daytime use is the same person with the same faraway look.
Wiktionary 記 dreamer 來自中古英文 dremer，由 dream 加 -er 組成，荷蘭文 dromer、德文 Träumer 同源。這個字原本就是「作夢的那個人」；白天那個用法，還是同一個人、同一種放遠的眼神。
Wiktionary entry for dreamer, etymology field: "From Middle English dremer, dremere, dremare, equivalent to dream + -er..." (kaikki:3f6f69a190036ae4:1168419939:34800)
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