Blocking out light, even at night, is important for a good night’s sleep. "Melatonin, a hormone that controls your sleep-wake cycle, is secreted at night in response to darkness," said Samuel Krachman, director of the Sleep Disorders Center at Temple University Hospital. "Light interferes with its production, making it harder to fall into a deep, restful sleep."

An attempted suicide at a Philadelphia shooting range this week is the latest in a sporadic series of such events. While Pietro Miazzo, a forensic psychiatrist at Temple University Hospital, sees no particular uptick in gun range suicides, he has heard of them before. “A gun range offers an opportunity to obtain a gun, the opportunity of handling a gun without anyone becoming alarmed necessarily,” he said.