Sharing a bed with someone could temporarily reduce your brain power - at least if you are a man - Austrian scientists suggest.

When men spend the night with a bed mate their sleep is disturbed, whether they make love or not, and this impairs their mental ability the next day.

The lack of sleep also increases a man's stress hormone levels.

According to the New Scientist study, women who share a bed fare better because they sleep more deeply.

[Via]

Related Links:
How much sleep do we really need?
Sleep position gives personality clue