look up any word, like timebomb:
 
1.
The act of sleeping during the day and waking up after dark.
After working all night galaxy goes into vampire mode.
by Anguish March 01, 2013
 
2.
When you have been binge drinking for so long that your body rejects solid food.
I've been off work for a week and I'm in vampire mode now.
by stupenzo October 03, 2013