To sleep, perchance to beat cancer

Professor David Spiegel from Stanford Medical Centre in California has put together evidence that how people sleep affects their hormone balance and could be linked to cancer. One study found cortisol, a hormone which peaks around dawn, can regulate the immune system and the cells that attack cancer cells, whilst melatonin, produced about 90 minutes into sleep, is an active anti-oxidant and can slow production of oestrogen, which is linked to certain cancers.

Cancer Prevention Research pre 2009
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