A study on the efficacy of NM191 (developmental code)

INTERVENTION: Ingestion of NM191 (development code) at bed time once a day for 4 weeks Ingestion of placebo beverages at bed time once a day for 4 weeks CONDITION: Healthy adults suffer from stress PRIMARY OUTCOME: Comparative evaluation of objective sleep efficiency and subjective indicators of the sleep quality with OSA sleep inventory between before and after the intervention. SECONDARY OUTCOME: Score on the Brief Job Stress Questionnaire, autonomic nervous index with heart rate variability, biochemical components in blood, saliva and skin surface lipid before and after the intervention INCLUSION CRITERIA: