Jarrow Formulas® Sleep Optimizer® combines herbs and amino acids that work together to facilitate falling asleep and maintaining a regular sleep cycle.* Gamma-aminobutyric acid (GABA), lemon balm and L-tryptophan promote relaxation.* The combination of valerian and hops has been studied for its effect on reducing latency (the delay before entry into sleep).* Melatonin is a neurohormone, secreted by the pineal gland that controls the biological clock and signals the entry into sleep.* Our biological clock can be disturbed by stress, crossing time zones and changing work shifts.