I read this article recently:
http://articles.mercola.com/sites/articles/archive/2014/04/03/sleep...
The big take-away for me was this:
Previous research, published in the journal Science,8 has also revealed your brain removes toxic waste during sleep through what has been dubbed "the glymphatic system."9, 10, 11, 12, 13 This system ramps up its activity during sleep, thereby allowing your brain to clear out toxins, including harmful proteins linked to brain disorders such as Alzheimer's.
By pumping cerebral spinal fluid through your brain's tissues, the glymphatic system flushes the waste, from your brain, back into your body's circulatory system. From there, the waste eventually reaches your liver, where it's ultimately eliminated. So it's quite likely that sleep affects your brain function and your risk of degenerative diseases such as Alzheimer's in more ways than one.
I can't be the only one with MDD who has deeply disturbed sleep because the daydreams don't shut off just because we want/ need to sleep. This scared me quite a bit.
Thoughts?