Potty training at night time

My daughter has been potty trained for about 4 months. I started letting her wear panties at nap first since it was shorter time and she did great. I just started night time, and discovered on the very first time I really do not enjoy changing sheets in the middle of the night. So I hear a great tip with a solution. I got a second waterproof mattress cover and I make the bed like normal then I make it again. So it is cover, sheet, cover, sheet. That way if she has an accident in the middle of the night I just take off the top to and it is already made again. One less thing I have to do when I am still half asleep.