Motaz Andy Murphy writes on Medium about breath work in order to get a good sleep. It really works.Here's a link.

https://www.google.com/search?q=medium.com+andy+murphy+breathing&client=firefox-b-d&sca_esv=568157848&ei=eGYRZcXjE8iehwPIg6HABw&ved=0ahUKEwjF_8WOzMWBAxVIz2EKHchBCHgQ4dUDCA8&oq=medium.com+andy+murphy+breathing&gs_lp=Egxnd3Mtd2l6LXNlcnAiIG1lZGl1bS5jb20gYW5keSBtdXJwaHkgYnJlYXRoaW5nMgUQIRigAUjFQFDrCFiSLXABeACQAQCYAe8CoAHsE6oBBTItOS4xuAEMyAEA-AEBwgIIEAAYogQYsAPCAgQQIRgV4gMEGAEgQYgGAZAGAg&sclient=gws-wiz-serp