Often lost subjects do not start out lost—they simply run out of daylight and are unable to get back to their car or the trailhead before night falls. Once it gets dark, the chances of getting lost become much greater. Although we are all equipped with limited night vision, we are much more vulnerable after dark and moving at night can be dangerous without a source of light. Carry a flashlight or headlamp (and spare batteries!) with you on all outdoor adventures, even if you only expect to be out for a few hours.