91色情片

Being sedentary is one of the causes of deep vein thrombosis. So why don鈥檛 we get DVTs in our sleep?

Cormac Byrne, London, UK

We pay 拢25 for every answer published in New Scientist. To answer this question 鈥� or ask a new one 鈥� visit newscientist.com/lastword. Terms and conditions apply.

This article appeared in print under the headline 鈥淪leeping sickness鈥�