>>I do not know the specific answer to your question, but I use www.master.com watchdog feature to 1 - keep the site alive and 2 - to report to me if it goes down.
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>There is no problem with the site. What I am trying to explain here is the sleep mode that IIS goes into if no activity is on the site. But, the site responds. It is just that when a hit will arrive, after a period of no activity, it will take longer for IIS to start responding such as 3 to 4 second instead of 0.2.

master.com watchdog can hit the site every 15 minutes, keeping it alive so it does not take 3-4 seconds, provided it is visible to master.com