More Than 8 Hours Sleep Too Much of a Good Thing
(NY, Reuters Health, 4/15/04)

When Michael Grandner, Dr. Daniel Kripke and colleagues at the University of California in San Diego tabulated the answers of 1004 adults to sleep questionnaires, the researchers found that people who routinely sleep 9 or 10 hours nightly experience more sleep problems, including trouble falling and staying asleep, than those sleeping 8 hours. The scientists theorize that too much time spent in bed may create sleep problems and spending less time in bed may help insomnia. On the other hand, there may be connection between sleeping for long periods and depression, but it is not clear whether the excessive sleep causes the depression or vice versa.