Why men fall asleep after sex

Here is new research on the obvious:

'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,' said Dr Neil Stanley, director of sleep at the University of Surrey.

'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. ...

Not everyone nods off after sex. The survey found 48 per cent of men had actually fallen asleep during the act itself.

A mere 11 per cent of women admitted being guilty of this.

A key word is "admitted". Surveys also show that women lie about sex more.