Why a good night’s sleep may help you get pregnant: Women who had severe difficulties resting had only a 48% chance of conceiving

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Based on the results, the patients were divided into three groups: no sleep difficulties (65 per cent), mild difficulties (26.8 per cent) and severe difficulties (8.2 per cent).

The chance of eggs fertilised in the laboratory successfully growing into embryos was then assessed. The eggs of women with no sleep problems were successfully fertilised 62.9 per cent of the time, falling to 57.1 per cent in those with mild sleep difficulties, and 48.4 per cent in patients with severe difficulties.

The researchers said: ‘Good sleep patterns can be one of the important daily habits for patients to improve their response to fertility treatments and increase their chances of pregnancy.’

Occasional or moderate alcohol consumption had a positive impact on fertilisation, they found. This may be due to the beneficial effects of a moderate amount of alcohol, such as relieving stress and inducing sleep.

Professor Matthew Walker, of the Sleep Research Centre at Berkeley University in California, who was not involved in the study, said the findings were consistent with other research.

He said: ‘For example, women sleeping less than six hours per night suffer a 20 per cent reduction in a follicular-releasing hormone – a critical female reproductive element that peaks just prior to ovulation and is necessary for conception.’

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