You're in your room late at night

You’re in your room late at night. You’ve been on the computer for a while now, and it’s almost time to get some sleep. The light behind you is still blazing, cutting a swath through the oppressive darkness of whatever ridiculous hour of the morning it is. In a sleep-deprived haze, you amble over to the light switch and flick it off, and instantly realize you screwed up. Your headphones are lying on the floor, and without the light to see them you’ll probably step on and crush them. Resolving to turn the light back on so you can grab them, you spend less than a second in near-perfect darkness as this goes through your mind. Then you flick the light back on.