Chamomile is an herbal depressant and can instigate allergies. Photo Credit Medioimages/Photodisc/Photodisc/Getty Images. Sleepytime tea is a type of herbal tea produced by Celestial Seasonings. The company maintains that this tea is made from all-natural herbs, has zero calories and is caffeine free. According to Celestial Seasonings' website, Sleepytime tea has a comforting aroma that can help soothe your body after a long day.