Admittedly, every time an airliner takes off and lands it goes through a demanding cycle of stress reversals.

ECONOMIST: Aircraft fatigue

It can be a vicious cycle - stress can lead to insomnia or depression, or other physical symptoms, which in turn decrease performance at work, and increase the level of stress experienced.

BBC: Stress: The effects

Reflecting these concerns, the Federal Reserve is considering another cycle of bank stress tests to determine the exposure of US banks to European debt crisis.

FORBES: Can The World Afford Another Round Of Bank Bailouts?