Unlike coffee, the caffeine content in chocolate is extremely low and usually insignificant. The primary compound responsible for Cacao’s energizing properties is Theobromine, a cardiovascular stimulant that has less impact on the central nervous system than caffeine. It is also a vasodilator and diuretic, and relaxes the smooth muscles including those in the respiratory system. These properties have been shown in scientific studies to promote healthy blood pressure and relaxation. However, in larger amounts, theobromine may produce some uncomfortable effects the way caffeine can. Contrary to caffeine, which usually causes insomnia and anxiety, theobromine has been shown in studies to be beneficial to sleep. The theobromine and minimal caffeine content of cacao is not linked to sleep disturbances or anxiety.