Sharing a bed may also reduce cytokines, involved in inflammation, and boost oxytocin, the so-called love hormone that is known to ease anxiety and is produced in the same part of the brain responsible for the sleep-wake cycle.

WSJ: Who Sleeps Better at Night?

The murder was the result of months of secret meetings and phone calls between Mr Nowak and Ms Lagwinowicz, with Miss Wells-Burr oblivious to her part in the so-called "love triangle", the court was told.

BBC: Catherine Wells-Burr

The cold turkey scene has cropped up in films like Trainspotting and soap operas like EastEnders, where a parent uses so-called "tough love".

BBC: Can a parent save their child from addiction?

Many retailers and other direct marketers love this so-called retargeting because when done right, it reaches people more inclined to buy.

FORBES: Facebook And The Web: A World Apart, At Least For Retargeted Ads