ThinkPad X220 sleep/hibernate?

It seems that my TP is cycling from sleep to awake depending on emails or notifications. I can see the moon LED go on/off and I hear the beep.

Is there a deep sleep mode in which the HackinPad does not wake under any circumstances? Or is there a setting for how often it wakes to check?

I recently found the laptop had a dead battery after a week or so off the charger and this seems to be the cause because it doesn't fall right back to sleep, rather after some (short) amount of time.

submitted by /u/Fyodel
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