"Especially good for all griefs and pains of the head and brain." 
That's lavender for you. 
Perfect for those with insomnia and anxiety. Lavender helps  the very deep sleep in which the heartbeat slows and muscles relax. Helping you feel rested and ready to start your day the next morning. 
You can buy it as an oil to soothe your skin or diffuse it. It also sold as a  massage oil at different stores. If you are a little more traditional you can plant, harvest and dry this plant to hang in any room to repel mosquitoes and aromatize any part of your house. If you have any interest in doing this check out this link: http://www.countryliving.com/gardening/garden-ideas/advice/g598/lavender-0908/?slide=4

Personally, I just had the best sleep in 6 months after using a lavender oil on my neck, arms and hands right before bed. 

Worth it. 

For more information: 
http://www.prevention.com/mind-body/natural-remedies/how-lavender-can-help-you-sleep