Are you suffering from insomnia if you have the occasional night when you don't sleep well? Latest research reckons the odd night's bad sleep doesn't add up to insomnia - that's reserved for those who have a poor sleeping pattern lasting for one year, and sometimes three.
Researchers were surprised by the extent of poor sleep that a group of 388 insomniacs suffered. For 74 per cent of them, regular poor sleep had lasted for a year, and for 46 per cent of them, for three years.
While more than half - 54 per cent - experienced 'remissions' from insomnia when normal sleep was re-established, half of those saw their insomnia come back.
(Source: Archives of Internal Medicine, 2009; 169: 447-53).