He could be looking for neurological problems? I'm not saying you have this particular problem but there could be something with the particular images he asked about that indicate something? I would ask him.
Quote:
Q: A few years ago, after a few scary and violent sleep incidences, I was diagnosed with a REM sleep disorder. I am presently on medication to control it, but I was wondering what the latest thinking was for long-term prognosis?
Stickgold: If you are referring to REM sleep behavior disorder, where you physically act out your dreams while still awake, possibly attacking and even injuring a bed partner or fleeing from a dreamed danger and injuring yourself, there is now evidence that you are more likely than average to develop Parkinson's disease in the future. It would be worth talking with your physician or a neurologist about these risks.
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From:
http://www.pbs.org/wgbh/nova/body/stickgold-dreams.html