Native to the south-western United States as its name indicates, the California poppy, found under the scientific name "Escholtzia", has been used for centuries for its calming properties.

It is recommended for people who have difficulty falling asleep and whose nights are strongly disturbed by recurrent awakenings. Indeed, the California poppy has relieving properties on nervousness: by calming the body and the mind, it favours a rapid fall asleep and restful nights of sleep.