The action of “Samozdrav” is based on the restoration of the normal level of CO2 in the organism. Carbon dioxide influences the permeability of the membranes, thus regulating the excitability of the nerve cells. A lot of researches demonstrate that the lack of CO2 provokes the excessive excitability of the nerve cells. In this way regular respiratory exercises, which increase the level of CO2 in the organism, help evade the excessive excitability of the nerve cells, nerve stabilisation and have a relaxing effect. As the constant nervous overexcitement provokes insomnia, regular respiratory exercises help the improvement of sleeping.