Posted by Jack (209.139.58.234) on September 16, 2000 at 16:16:03:
In Reply to: Seratonin posted by Drue on September 16, 2000 at 14:20:54:
Serotonin goes to zero during REM sleep.
During a cycle there is no more universal trigger than Sleep (of the REM variety )
in my pompous and pedantic opinion :-)