Why do women need more sleep than men?

I had never heard this before, but this is what I found,

According to  Dr. Jim Horne , Britain's leading expert in sleep science. In an article published in the  Daily Mail , Horne explained that on average women need twenty more minutes of sleep than men. The researcher pointed out that women tend to multi-task and use more of their actual brain than men leading to a greater need for sleep.

Yes. Women use their brain more daily than men do.  Seriously... Because we multi-task by doing 1-3 things at a time. 

Men usually do one thing at a time.

Our brain needs more sleep because of this.