When I worked nights, I needed total darkness in the bedroom during the day. I hung a miniblind, then taped a layer of aluminum foil around the window frame, then hung a curtain over that. From the street, you see the blind, and from inside the room, you see the curtain. The foil doesn't show at all and it's a cheap and effective light blocker.
How To: Dress Your Bedroom Windows for Healthy Sleep | Apartment Therapy San Francisco
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