But as a side sleeper who rolls around a lot at night, now I understand.
This would be good for those who have bags with out hoods (like some of the Big Anes bags) and who toss & turn all night.
OK, sometimes I'm slow at catching on.
"Courage Grows Strong at a Wound" - Stewart Clan Motto
i've found out that if it's cold enough to be really cold my care about comfort falls way off the chart. if it's not cold enough to be really cold i care about comfort.
So, I had a separate Marmot Dryloft down sleeping bag hood with me( well over 2.5" loft). I don't even know why I brought it sense it was to be well above 20. But I put it on and crawled back into the BMBH. In no time at all I was not only no longer cold, but luxuriously warm. A huge dif! ( I was surprised at the magnitude of the dif, as I already had the jacket hood on, though it was no where near as thick as the Marmot hood.) I can only figure this would work even better if attached by Velcro (or whatever) to a vest.
It is a little heavy though- and maybe over kill- so I plan on looking into one of those JRB hoods. And the ability to turn under a quilt and have the hood turn with you, without having to turn the entire mummy bag with it's compressed bottom layer of down now turned up, is much appreciated.
Bottom line: a true mummy bag equivalent hood is a major boost to warmth, whether used on a mummy bag or dded to a quilt. But the quilt/hood combo is way more comfortable for most of us, I suspect.
Apparently, signature that I used from 2006 no longer tolerated so now deleted.
Probably gonna have to work till I get to sit on Santa's lap again before I get to try a quilt. Too warm in the south these days anyway to worry about it. 4x6 fleece quilt is all that is called for over the next half year.
I find the easiest method for me is to leave the bag zipped up and just bunch it up at my feet and wiggle it on like a tight pair jeans. That way i dont have to bother with zippers.