I don't look at my plants at night per say, but I do make an attempt to look at my D. Multifida at sunset when the sunlight is streaming through those thousand or so little balls of dew, very pretty...
I do don the head gear for my reef tank though. It is a headband that emits red light from LED's, since most reef critters can't see red light, it doesn't scare them, and I get to see things I can't see during the day, like thousands of copepods and amphipods running around, bristle worms cruising the substrate, spaghettie worms throwing out their tentacles to grab food, mini-sea stars comin out for dinner, so on and so forth... I am thinking about adding some bio-luminescent 'flashlight fish' to the mix.)