In actual life, I own this 19th century, linen nightgown with the original owner's name penned on it in brown ink. In my dream, I'm wearing this nightgown, and I wander outside onto our front porch. It's both summer and winter out. The moon is bright and the light is blue. I notice/remember that we cut a hole in the roof over the porch to make a little mini-Moonhenge: the moon's perfect alignment over the hole in the porch roof at a certain time of year would allow a column of light to pour onto the porch floor. I decide to lie down on the floor under the column of moonlight for magical purposes.
Then I realize that if our houseguests find me out there, I'd have a hard time explaining it, so I go back inside.