With the nights getting colder and DS turning into a mega-wiggle bum when he sleeps, it is time to think about getting a grobag or similar for winter. But I am pretty confused! Can someone answer the following questions....?

1. What is this TOG business? What is the highest TOG? What TOG should I get for winter for a house that gets pretty cold at night?

2. Grobag is the brand, right? Are there any other brands that are as good (but maybe less expensive)??

3. Can you get any of these at Target or Myer? I have a coles myer card I am thinking about using for this purchase.

4. None of them seem to have sleeves. Is that right? What do you put them in under the bag to make sure their arms keep warm?

I think that's all! Thank you!!