Camomile flowers Anthemis nobilis have many uses and all of them are soothing. If you want to make Camomile tea, pick the flowers when the white petals begin to droop. I have never seen an exact measurement of how much camomile flowers to add so just make it to your taste. Drink a cup of camomile tea just about bedtime. Sweet dreams.
I remember Peter Rabbit's mother giving him a cup of camomile tea and never forgot it. Maybe that is why I dearly love my camomile tea in the evenings when I have some.