Chamomile has been valued as a digestive relaxant and has been used to treat various gastrointestinal disturbances including flatulence, indigestion, diarrhea, anorexia, motion sickness, nausea, and vomiting (34, 35). Chamomile has also been used to treat colic, croup, and fevers in children 

Warnings. The safety of chamomile has not been well established for pregnant or nursing mothers, for children, or for those with liver or kidney disease. Chamomile use should be discontinued at least two weeks before a scheduled surgery or dental work because of the increased risk of bleeding.

Chamomile is particularly effective at making you feel sleepy because of its chemical structure. The plant extract contains apigenin, a chemical compound that induces sleepiness when it binds to the GABA receptors in the brain.