Chamomile 

Anthemis nobilis

The Egyptians thought this was a sacred flower and dedicated it to the Sun God. It was used in ritual ceremonies and medicinally to stop fits and fevers.

Therapeutic effects: Particularly noted for its anti-inflammatory and sedative properties, it is excellent for childhood ailments (whether in children or adults!) from peevishness to earache. Also used for allergies, anemia,burns, dermatitis, diarrhea, fever, indigestion, insomnia, menstrual and menopausal problems, rheumatism, toothache and ulcers. 

Uses: Certain chamomile species are used for herbal infusions, but the oil is used in body, bath and hair products for its anti-allergenic properties. Use in dilute form for children.

Other popular ways apart from the above include, diffusers, on your pillow at night, meditation, car air fresheners and in steam / saunas.