One of the super cool things that happens with Restorative Hypnotherapy is the way it changes your body-brain chemistry. Just as stress and tension are identified with chemicals such as adrenaline, epinephrine and cortisol, so deep relaxation has its own chemical signatures. Some of these are, in no particular order:
Serotonin, oxytocin, nitric oxide, anandamide, endogenous diazepamides, endogenous cannabinoids, melatonin and n-n dimethyltryptamine (also known as DMT).
No wonder clients often report after a session, "I felt high for days!"