http://news.yahoo.com/s/time/20090616/hl_time/08599190456100

[eastcoasttoker]

That palliative safety-valve quality of sleep may be hampered when we fail to reach REM sleep or when REM sleep is disrupted, Walker says. "If you don't let go of the emotion, what results is a constant state of anxiety," he says.

http://news.yahoo.com/s/time/20090616/hl_time/08599190456100