Chronic low-level noise and low-frequency noise that go under the threshold of human hearing actually stir up stress hormones that could mess with learning and could also raise blood pressure, degrade the immune system, and increased aggression will be observed.
Laughter cuts down the level of stress hormones namely cortisol, epinephrine (adrenaline), dopamine as well as growth hormone. It also raises the level of health-enhancing hormones such as endorphins.
Laughter boosts the number of antibody-producing cells we have working for us, and improves the effectiveness of T cells. They all help for a stronger immune system, and fewer physical effects of stress.
Laughter provides a physical and emotional release. It can bring the focus away from anger, guilt, stress as well as negative emotions in a more healthful way than other plain distractions.