While cinnamon essential oil is known for its stimulating properties, such as increasing alertness and boosting energy levels, it is not typically associated with causing sleepiness. In fact, the opposite may be true due to its invigorating scent. However, individual responses to aromatherapy can vary, so some people may have different reactions to cinnamon essential oil. It's always a good idea to test how your body responds to any essential oil before using it at bedtime or when relaxation is desired.