sleepless nights

Männer sollten sich überlegen, ob sie das Bett mit einer Frau teilen wollen, ihr IQ leidet:

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.
Bed sharing 'drains men's brains' | via BBC news/health |