[Zope] Debugging a Zope Server

Hi, we started a new service for our online newspaper, that is served by a Zope server. (http://rz-anzeigen.de) We currently experience the problem, that the machine serves really well and also during the high traffic times. But sometime in the early morning the Zope process crashes. Now I like to know if it is possible to get some more specific out from the Zope server when it crashes. Can I activate some kind of logging to monitor this, or something else that helps me to deal with this? Or is my only option to start the Server form the shell and see what traceback I get? Bye, Oliver