Anything we can do to protect our brains from dementia is welcome. On Friday, I showed you how a simple habit can cause serious memory problems. 

In the past, I've told you about how important sleep is for your brain. Researchers have linked a lack of sleep to Alzheimer's disease and other forms of dementia. It's absolutely essential to your health that you get enough sleep. But even more than that, you need to sleep at the right times.

The body is a very complex system. As doctors, we're often faced with the unknown. And we have to do a bit of guesswork to figure out what's going on.