Suzi (16 Apr 2011)
"Article about sleep disorders"

http://www.thetelegram.com/News/Local/2011-04-11/article-2417099/Taking-on-the-old-hag/1

Since this was recently brought up, thought I'd post this new article I found. I'd say if the symptoms come and go, it's more likely a disruption in your sleep patterns, and from personal experience, seismic activity...possibly related to sunspot activity too.

Blessings~

Suzi