If you're interested in the importance of sleep, then read a book by
Matthew Walker called
Why We Sleep.
ISBN 9780141983769
(Available used for under £4 at
World of Books)
It's fascinating, illuminating, and alarming in equal measures.
Written by a professor of neuroscience and psychology, it debunks a number of myths using peer-reviewed scientific research.
You won't look at sleep the same way ever again.