Mettä Calm Sleep Herbal Tea is a carefully selected blend of Finnish herbs, such as fireweed leaf, raspberry leaf and heather flower, that have traditionally been used in Finland for their calming and relaxing effects. Enjoying a cup of tea in the evening is a particularly relaxing way to let go of the past day and prepare the body and mind for a calming night of sleep. Naturally caffeine free. How to use? As a tea: measure 1 tsp of herbal tea to a cup (2 dl) of simmering water and let brew 2-4 min. Sweeten with honey if desired.