I first noticed it years ago when my Filipino wife's family moved into our house. Rising in the middle of the night for a glass of water, I'd see the eerie glow of white light flowing out from around the edges of her parents' bedroom door. Once, thinking they'd forgotten to flick off the switch, I quietly entered the room and did it for them. Only to be surprised the very next night by the very same spectacle.
Wow, I remember thinking, is this a family thing or a Filipino thing?