With a world economy that is the antithesis of calm, I'm thinking of cash on the macro and the micro levels. Recently I have been waking in the wee small hours with a spreadsheet in my head.
Rather than counting sheep I'm crunching numbers.

It is also attachment to things that are impermanent. And what is less permanent than money? My experience is: money comes in, money goes out...
Gradually, with mindfulness practice and breathing exercises these alarming anti-sleep experiences are abating. But I am interested in my relationship to money and our whole society's dependence on the stuff. We know that money doesn't equal happiness. But still we rush after it. Without doubt we know that debt is a calm killer - look how real estate and shares fluctuate due to the mass panic waves of the punters. These phenomena are great illustrations of a new health issue I've christened CDD Calm-Deficit Disorder and it's an epidemic.
In the spirit of the Choosing Calm project, I am looking to any source or text that seems to provide good ideas on how to live well in this world, at this time. On this cash vs. calm topic I have turned to Chief Rabbi Lord Sacks for his wisdom on wealth.
The best commentary on all this was given by Moses in the book of Deuteronomy. He is addressing the next generation, the children of those who had been liberated from slavery. He tells them, surprisingly, that the real trial is not poverty but affluence. Affluence dulls the senses. It makes you forget where you came from. You start taking prosperity for granted, not realising how vulnerable it is. Bad things begin to happen. Inequalities grow. The social bond becomes weak. The nation forgets who it is and why.