Vampire Energy completely depleted, help

I noticed that too. The only way I've seen to quickly fix it is to use the needs cheat. In the cheat box, type testingcheats on, and hit enter. Then you can shift + click on any Sim and choose Cheat Need, then Make Happy, you can also disable need decay. Although I've found it randomly turns back on. Then if you want to turn the cheats off just type testingcheats off, but I always leave it on.
There doesn't seem to be any fast way to fill with regular game play, just sleeping or meditating.