For Safety's Sake - Install a Night Light - I am a person who likes to do "Green things." I switched most of the light bulbs in my house to CFL. I turn off my computers, printers, scanners, and monitors when not in use. I unplug appliances when they are not in use. But sometimes being green means the house is pretty dark (with the kids away at college, my wife and I don't usually turn on lights for just a few minutes).
After we turned back the clocks last week, our house became noticeably darker at an earlier time. My wife went down to the kitchen to get a cup of water and then headed back upstairs to the office (it was only 6 P.M.). The upstairs landing was pitch dark. She misjudged where she was (her hands were full), and she tripped over the last step because she thought she was at the top. Thank goodness it wasn't a bad "spill"--just water everywhere--she was fine. However, I immediately plugged in a night light at the top of the stairs.
When we have company, we leave the hall light on (CFL bulb) all night long. About 25 years ago a family friend was visiting her daughter and got up during the night. Not realizing where she was and being in the dark, she fell down the stairs and became paralyzed for the rest of her life. Something as simple as a nightlight could have prevented this.
For the cost of running a 4-watt bulb or two to light the darkest corners of your home, please install a night light (especially if you have just moved in to your home--it takes a while to get used to new space).