Yesterday we got our monthly electric bill and it was almost 50% HIGHER.

We have gas heat and live in Indiana, so usually in the wYinter, our electric bill goes down and our gas bill goes up. Our gas bill is almost normal, but our electric bill is sky-high for this time of year. The only major things in our home that are electric are the washer, dryer, and stove. The water heater and home heating are both gas.
My sons were sick this past month and we ran TWO vaporizers almost every night. (Vicks steam vaporizers) That is really the only thing out of the norm that we did. Cooking and baking have been about the same, as well as laundry.
Do vaporizers really use that much energy? We also have a small portable cool-mist humidifier, but we had it last year and didn't really notice any difference in our electric bill. We have a computer, but we've had it for the past 6 months and hadn't noticed anything abnormal in our electric usage.
I can't think of what could be causing this huge jump! Maybe it's something obvious and I am just not thinking of it. Does anyone have any suggestions? Also, do you have any great tips on reducing electric usage (besides turning off lights, etc) ?
Thanks so much... and MERRY CHRISTMAS! My sons woke me up at 5:15am this morning, so I am going to collapse in bed as soon as I'm done typing this. ZZZZZZZZ.....