10/02/2011 - A Good night’s Sleep
There are many theories about why we sleep – physical repair, memory consolidation and general processing of the day’s experiences. However, one thing is indisputable: the profound importance of sleep for our health and optimal functioning.

Before artificial lighting, our sleep/wake cycle was regulated by the sun, establishing a circadian rhythm that ensured a good night’s sleep. This was recently confirmed by researchers at Johns Hopkins University, who disrupted the sleep cycle of mice by interfering with light signalling to the brain.

When darkness falls, we produce melatonin, a hormone that not only promotes sleep but also enhances immune function and may inhibit the development and growth of cancer. Most of us unwittingly sabotage this natural process by extending our waking hours and allowing light sources in the bedroom. Even a small amount of light can drastically reduce melatonin levels, so it is worth taking a few steps to improve the quality of your sleep:

• Cover or switch off illuminated displays on clocks and radios
• Use blackout curtains or wear an eye mask to block street lighting
• If you can reach the bathroom safely in the dark, don’t use the light
• Be in bed by 10pm and limit your sleep to eight hours
• Get plenty of exposure to natural light during the morning