Around 60 million Americans suffer from insomnia each year. On today's Please Explain, find out what causes insomnia...and what you can do to get some sleep. Also: celebrating the life and work of Peter Jennings. We hear the history of Arabs and Jews in the ancient port city of Jaffa. And a look at the new play Masked. Guest host Julie Burstein sits in today for Leonard.

Our Thanksgiving cartoon contest is in full swing. Find the funny side of Thanksgiving, and submit your original cartoon here.