INTRODUCTION CHRONIC PAIN IS A SERIOUS HEALTH PROBLEM WITH INSOMNIA AS ONE OF THE MAJOR COMORBIDITIES THERE IS A RECIPROCAL RELATIONSHIP BETWEEN CHRONIC PAIN AND INSOMNIA WITH THE ROLE OF SEROTONIN IN BETWEEN SEROTONIN IS A NEUROTRANSMITTER THAT MODULATES NEURAL ACTIVITY AND AFFECT VARIOUS NEUROPSYCHOLOGICAL PROCESSES INCLUDING PAIN AND SLEEP CYCLES
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