According to Kim, those who believe that Himalayan salt lamps improve air quality recommend leaving them on continuously—or at least all day, or all night, for a minimum of 12 hours—to feel the benefits. Otherwise, if you’re using the lamp to make a room more relaxing, simply keep it on while you’re using it. Take the bedroom, for example. “Let’s say you want to replace a fluorescent light and an overhead light with something more soft and calming,” Ziskind says. “A Himalayan salt lamp is a great choice for your nightstand.” Although, as she points out, it will not provide as much (or, in some cases, sufficient) light for reading, it’s a soothing way to end your day, eventually turning the lamp off before you drift off to sleep.