how to wakeup a sleeping mac ?

In "System Preferences/Energy Saver/Schedule..." you can define wake-up (and shutdown) times for your Mac.

Other than that, I think the only option to wake a Mac from "deep sleep" would be wake-on-LAN. This can help you there:
http://www.coriolis.ch/en/wakeup/

(I haven't tried it myself, though.)