Motion-activated night light turns on automatically when you get up in the middle of the night. No more stumbling around or waking your partner on your way to the kitchen or bathroom. Infra-red detector has a range up to 25 feet, stays lit for 20 seconds. Mount on bedside, wall or nightstand with included Velcro sticker. Requires 4 AAA batteries (not included). 5 x 1 1/2". $11.98
And since they didn't mention it, I'm assuming there is no on/off switch. What this means, is that all day long, this thing will wear itself out. While you're getting dressed, while you're getting undressed, while the social worker is putting you back in your bed, while your dog or cat moves about, while you pack for the "home", while you fall out of bed, etc... Those batteries won't stand a chance.
Worried about waking your partner up? Well, it's obvious that you are in some kind of abusive relationship. Just tell him or her to "shut up" and be done with it.