Try chamomile tea. It has been used for centuries for relieving stress.
Chamomile has many different applications: sedative, relaxant, depression aid, stress reliever, soothes teething and colic, calms the digestive system, settles nervous indigestion, gastritis, relieves headaches, menstruation, disorders of the kidney, liver and the bladder, hay fever, insomnia, hiccups, etc.
Search the internet for 'stress chamomile' and you will find out more about chamomile and its uses.
I drink chamomile tea in the evening to relax and sleep better.