Sleep is a wondrous thing -- our bodies get to rest and recharge chemically (from a biological standpoint), while our mind sorts out the junk from the day and catalogs some things while throwing other things in the trash for disposal later.

It's been said that we remember everything, every day -- and our brain files away all that data for later recollection (or not). The science of sleep was renewed in that vein recently by Dr. Ross Levin, who looked at why long-ago memories could be brought back into people's dreams when triggered by different types of trauma.

This is common in war veterans, many of which can lead normal lives until a traumatic even spurs old memories and some kind of downward spiral happens as a result.

Can therapy help those who have sleep disorders or constant nightmares as a result? Dr. Levin thinks so, and for those who have crippling sleep episodes, proper treatment can be the only alternative.