hey dude, i accidentally had the same experience... there was 1 night that i manually switched of one power point thinking that its my handphone charger, unaware that it's the main power supply for my filtration and powerheads!!! just realized it the next morning when i saw no movement in my tank... really stupid of me i admit, thank god no casualty at all.....
well, not saying its advisable not to do anything, nor it would be the same situation as mine... but take precautions.. at least water movement if not filtration will help... car batteries, u reckon?