Where is the 'sleep' low power option in cyanogenmod 10.1?
You are right. Sleep mode is something from Motorola, not from Android. So, CyanogenMod (based on the stock rom) does not have this option. It has several other options, and you just need to find something close to it. You could try airplane mode, which turns off all connections (wifi, bluetooth, cellular, NFC, etc..)