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FWIW, I used to think the same thing about myself, but I moved into a loft with giant windows and no curtains in my room. There were a few rough mornings at first, but then I got used to it pretty quickly.
I think that direct beams of sunlight would probably be a problem for me (my windows face north, so no direct sunlight), but just natural morning light worked out fine. YMMV, of course.