It looks like a dream.
I have two window seats in my home, one in the dining room, one in the kitchen. I have sat there before and read, but I prefer reading in the den in a recliner chair....that's my reading nook.
Anywhere I am is a reading nook because I am always reading something. A dedicated nook? Too fancy and not practical in my world. The best reading nook ever is on the beach, no nooky about it.
Why I usually read all night in bed, not a silly nook. But my front window is ALL sun all day, I would love a sleeping nook there just to stay warm.
I don't think they're "silly". I do like reading in bed though.