When is a Nook not a Nook?

Long before the word "Nook" meant an e-reader device, it meant a cozy little built in space where one could nap, read, rest, or daydream in blissful isolation, as the whole idea is that it only fits one. OK, maybe two. Ahem.

A successful nook has pillows and blankets, light to read by ~ either electric or natural, a way to block that light if needed, perhaps a curtain for absolute privacy.

Four months into a Northeastern winter, I'd like to crawl in and be woken when it's spring.