darkness

Turn It Off! Light Round The Clock Speeds Up Aging In Mice

The implications for city-dwelling humans aren't great either.
By 

10 Awesome Products For People Who Are Afraid Of The Dark

Night lights are for adults, dammit.
By 

Artificial Lights Linked To Higher Rates Of Obesity

Scientists think the artificial light may suppress sleep and extend eating hours.
By Lisa Rapaport, Reuters