Primary Function: A multifaceted approach is needed to support falling asleep faster, staying asleep longer, and achieving higher quality, more restful sleep. Circadian PM™ utilizes a blend of 10 ingredients, promoting multiple mechanisms of action to nurture healthy sleep. Mechanisms of Action: Promotes a healthy central nervous system & promotes sleep initiation by:​ Increasing GABA, the primary inhibitory central nervous system neurotransmitter. Decreasing breakdown of GABA & its binding. Stimulating GABA receptor. ​Promotes undisrupted sleep by supporting healthy serotonin levels, leading to increased REM sleep. Reduces wakefulness by supporting healthy histamine levels in the brain. Supports a healthy response to anxiety, promoting better sleep. Promotes normal cytokine function to relax the central nervous system, leading to a healthy pain response