The crossword solution for the term 'BRIGHT LIGHTS, AT TIMES' is 'STIMULI'. STIMULI are external or environmental factors that can cause a response in an organism. STIMULI can be physical, such as light, sound, and temperature, or they can be chemical, such as hormones or pheromones. Bright lights can be a form of physical STIMULI, and when used at certain times, can be used to help regulate biological processes, such as sleep cycles.