Sorry darling, I just can’t help it: How scientists have found out the real reason why many men fall asleep after sex

It is no secret that many men nod off  straight after sex.

And for their female partners, the loud buzz  of snoring after a passionate encounter is practically  guaranteed to sour the mood.

But now scientists might well have given men  the perfect excuse for feeling drowsy: they just can’t help  themselves.

Experts conducted research which involved  scanning the brains of men during and after orgasm.

In the case of the latter, they found that  the cerebral cortex – which plays a vital role in attention, consciousness and  perceptual awareness – shut down almost immediately after orgasm.

Serge Stoleru, a French government scientist,  said that the research offers the ‘first hints’ of what happens in the brain  during sex.

He told the Sunday Times: ‘For women, it  seems to be different.

‘They don’t seem to have such a strong  refractory period and may be asking for more when their partners just want a  rest.’

The study also showed that the brain switched  off almost all sexual desire after orgasm.

And as well as this, men have a further  reason for feeling drowsy: their brains become flooded with sleep-inducing  chemicals such as serotonin after they have had sex.

Earlier studies have also suggested that men  aren’t to blame for wanting to take a well-earned break after sex.

In 2005, research found the blood rush after  climax depletes the muscles of energy-producing glycogen.

And because men typically have higher muscle  density than women, they become more tired after sex.

Dr Neil Stanley, director of sleep at the  University of Surrey, said that men were not completely at fault.

‘As frustrating as it is for most women that  their male partners just roll over and fall asleep after sex, men aren’t  entirely to blame,’ he said.

Dr Neil Stanley said although it is frustrating for women when their male partners doze off, science could provide the answer

Dr Neil Stanley said although it is frustrating for  women when their male partners doze off, science could provide the  answer

‘Humans are the only animals in which sleep  and sex are linked and while often seen as just a poor excuse, there are  scientific reasons why men feel tired after sex.’

The survey showed the majority of men did  feel more relaxed straight after sex.

Eighty per cent of men said they felt able to  drift off without any problems after making love, compared with just 46 percent  of women.

They were amongst 10,000 adults surveyed by  organisers of The Vitality Show, Europe’s largest health and beauty  exhibition.

The survey also found 48 per cent of men had  actually fallen asleep during the act itself.

And whilst scientists might have rescued men  from a telling off for sleeping straight after orgasm, it seems perhaps  understandable that the latest research won’t do the same for those who doze  before reaching climax.

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