This is kind of neat - and useful:

Try this relaxation technique several times a day, suggests Marion Harris, director of The Feldenkrais Centre in Toronto, which offers body movement therapy: sit and relax with your hands in your lap. Raise them in front of you, with your palms facing down. Wrap the fingers and thumb of your right hand around your left thumb. Then extend your right index finger and wrap the fingers of your left hand around it. Pay attention to your breath, then inhale and gently squeeze your thumb. Exhale and release. Do this eight to 10 times, pause, then do the same with your index finger. Pause again, and go back and forth between the thumb and finger. If you practise this often, it should bring you to a calm state – a handy trick when you wake up at 4 a.m.