A disaster can be taxing both physically and mentally. After a long day there is simply no better way to recharge than to snuggle up in a warm sleeping bag to get some sleep. Not only are sleeping bags great when you're on the road, but if your house is extraordinarily cold you could roll out your bags on your bed for some extra warmth. Glamping was never better.
Mummy bags are designed for sleeping in very cold weather. The body hugging form is thermally efficient, but it's not the most comfortable sleep when you can't move your arms and legs easily.
For long term comfort, and a broader range of temperatures, a three season rectangular bag is far more utilitarian. Something in the range of 30º. Not only are rectangular bags comfy and easy to get in and out of, they can be unzipped to become a blanket.
Don't forget that if you're still cold in your sleeping bag adding extra clothes such as a beanie, fleece jacket, thermal underwear, and socks can really warm you up.
Part of the best gear for your emergency bag.
The North Face Dolomite One Bag - 3 Layers of Insulated Warmth
The North Face Dolomite One Bag is quite unique. It unzips into three layers for a range of temperatures from 50º to 15º. My favorite features are the sturdy, easy to use zippers, the soft fleece lining with a wallet pocket, and the squared bottom with plenty room for your toes. You can completely unzip it to make it a blanket for hot nights. Check it out on Amazon.com.
For the kids the three season Bass Pro Eclipse 30º bag is comfortable and just the right size for younger kids. The inside has a soft washable fleece lining and it zips open completely to make a blanket. Available in blue and dewberry. Check it out on BassPro.com.