Watch: Laura Daniel conducts a 'scientific' study of the best way to keep warm in bed

We're deep in the throes of a winter, and everyone has their favourite way of keeping warm at night.

From modern marvels like the electric blanket, to the old fashioned hot water bottle.

But which is the best, and warmest way to go sleep?

Laura Daniel uses the highly scientific method of filming a whole story from the comfort of her bed to find out which is best.

The results are in the Seven Sharp video above.