light and warm mid layer for sleeping

There's a great number of synthetic and down sweaters that would fit the bill of keeping you warm around camp to 30 degrees and serve as a sleep layer and weigh 11oz or less, depending on your size:

Montbell Thermawrap jacket or parka
Montbell UL Down Inner or Parka
Montbell Ex Light jacket
Eddie Bauer First Ascent
Patagonia Nano
Patagonia Down Sweater

A slightly heavier but cheaper option might be a 200 weight fleece under your shell jacket.

"Montbell Thermawrap jacket or parka
Montbell UL Down Inner or Parka
Montbell Ex Light jacket
Eddie Bauer First Ascent
Patagonia Nano
Patagonia Down Sweater"

+1

To which I might add the WM Flight jacket.

I's recommend either down garments or good synthetic filled garments like Climashield or Thermolite Micro for camp ans sleep wear.

BUT your sleeping bag must be of sufficient girth to accomodate them without being too tight and compressing its insulation as a result.

Synthetic garments are less compressable and weigh more than comparably warm down clothing but, unlike down, they can be worn while very active with no danger of them getting so wet from persipration that they become useless. Thus their usefuleness is extended into trail wear.

If you've never winter backpacked while wearing a down jacket you haven't experienced a sweat soaked back of the coat after taking off your pack. I have and it was not pleasant in 10 F. weather.

The back of the down jacket finally dried after being draped over my sleeping bag overnight and shaken vigorously in the morning – only to repeat the wettig process the next day. :(

i find my driclime quite useful for summer temps. as others have said you're probably wanting a down layer (or synthetic) if that's not keepign you warm.

eric could you have put it on backwards and kept the majority of it out of between you and the pack? i guess hindsight's 50/50

If you are sweating at 10 degrees shouldn't you be removing a layer BEFORE you start to sweat. Sweat in winter is EVIL. Oh geez now I'm doing it too.