Wake on Lan (works, but not always)

Iam trying to get Wak on Lan working on my iMac. It works, but not always. When I put my mac to sleep en send the magic package, my mac turns back on. But when my mac turns to sleep and I wait a few hours (the next morning), my Mac doesn't respond to the same magic packag. When I wake up the Mac by hand, and put it back to sleep again, the magic package works again en turns the mac on.
It almost looks like the mac goes into a deeper sleep mode after a few hours. Does anyone knows what could ben the reazon.

mmm, It seems like my mac doesn't always turns to sleep mode. Most of the time it only turns off the screen (solid light). My energy settings are 10 minutes for the screen and 15 minutes for the mac. But after turning of the screen it never turns to sleepmode. Ecxept when I put it to sleep manualy.
Strange thing is: when the screen is turned of, shouldn't I be able to get tot my files... (I can't actualy).

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