Too much dreaming is bad for you? New Scientist interview with Joe Griffin:

The important thing is to know how depression is manufactured in the brain. Once you understand that, you can correct the maladaptive cycle incredibly fast. For 40 years it’s been known that depressed people have excessive REM sleep. They dream far more than healthy people. What we realised – and proved – is that the negative introspection, or ruminations, that depressed people engage in actually causes the excessive dreaming. So depression is being generated on a 24-hour cycle and we can make a difference within 24 hours to how a person feels.

(via Sashinka)