Why We Sleep

Here you can watch a short video with subtitles with 5 tips to help you sleep peacefully by professor Mathew Walker, a neuroscientist at University of California, Berkeley, and the author of the book Why We Sleep. Link B2.

If you want further information, you can listen to a radio interview (with the script) to Matthew Walker on NPR's programme Fresh Air.(Link C1)

Finally, you can also read an article  about the book from The Guardian.(Text B2)