For relief of occasional sleeplessness and for a restful nights sleep, Nighttime Sleep-Aid, Diphenhydramine HCl 25mg Caplets, is safe and non-habit forming. This nighttime sleep-aid helps you fall asleep and is gluten free. This product is not for treating cold and flu and does ...For relief of occasional sleeplessness and for a restful nights sleep, Nighttime Sleep-Aid, Diphenhydramine HCl 25mg Caplets, is safe and non-habit forming.