DEAR DOCTOR K: I've heard a lot about the harmful effects of insufficient sleep. But are there any dangers of sleeping too much?
DEAR READER: Over the years we've learned that sleep is important for a variety of reasons. It appears to be vital for forming long-term memories. It also helps you to digest what you have learned the previous day. Sleep promotes concentration and restores energy; it helps to keep your immune system functioning well and to regulate eating patterns.