Using Caching Service when the Server Sleeps or Users have logged out?

When the Mac Mini Server logs out all users, the OS X Server 3 should still be running to my belief.  Thus the Caching Service of the OS X Server 3 should still be running.  However, in a number of cases, I found that the time taken for an app download after the first time uses the same time for download.  So, I guess the Caching Service is not performing at all when there is no Logged-in user.
I further wonder why there is a Sleep Button at the User Log-in Screen and no wonder that the Server will not be providing Services (e.g. Caching Service) when the Server is in Sleep Mode.  Will the Server 3 be providing Caching Service while the Mac Mini Server has enter Sleep mode and it's just my configuration problem?

Here is an explanation of how caching server works.
http://nbalonso.com/os-x-server-caching/
In summary:
Your server periodically talks to apple.  Compares notes.  Verifies it is authentic.  Gets a certificate from apple to prove it is authentic.
If your device asks for something (contacts apple), Apple says that you have a local caching server, and responds with the info telling your device to try your local server first.  (includes certificate info, so your device is confident the local server that responds is actually authorized to do so).
If that goes well, then fine.  If not, then you device falls back to getting the info from Apple's servers.
If your server is asleep, then this process won't work.  Your server is supposed to phone home to apple (hourly?) to keep proving it is authorized to server updates, and to update Aple's record that it is authorized to serve updates for your private network IP address.

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