The indica highs are most often described as a pleasant body buzz. Indicas are great for relaxation, stress relief, and for an overall sense of calm and serenity. Marijuana indicas are also very effective for overall body pain relief, and often used in the treatment of insomnia. They are the late - evening choice of many smokers as an all - night sleep aid. A few pure indica strains are very potent in THC, and will cause the "couchlock" effect, enabling the smoker to simply sit still and enjoy the experience of the smoke.