I have several located throughout the house.
On my night stand next to the bed I have a J5 Tactical single AA light.
Also have one in the bathroom, my BOB and school backpack. I got a deal on them so I got several.
I have a little light affixed to my folding knife. Not very bright, but it does provide some illumination when needed.
In the "everything" drawer in the kitchen, there is a cheap, cheap 2 C-cell plastic light. I have it for several years and just can't part with it.
When walking the dog I use a single AA streamlight PT. We have a green belt in the back where I walk the dog and aside from other people walking their dogs, coyotes traverse it regularly and have several run ins with them. They usually keep there distance, but have drawn down on a couple a few times when they get too close, but back off when I shine the light straight at them. That plus the dog going ape-shit sends them on their way.
I the living room I have one of my old Underwater Kinetics SL6. (I have a UK SL4 in my truck.) Which I also use when taking a shower. I have used this on several occasions, most notably when I lived in FWB Florida after we got hit with hurricanes Erin and Opal.
Also in the truck I have my head lamp, with red light option, as well as a small single AAA LED light.
All can be easily accessible when/if the lights go out and I check and change the batteries the same time I change the batteries in the smoke detectors when we move our clocks forwards/backwards.