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I sweat a great deal when I sleep. When it's really warm outside at night I just keep my bag unzipped and there's no problem. However, when it starts to get cold and I have to zip my bag up, I soon become dowsed in sweat and even though my bag is rated well below the outside temperature I am freezing and have a horrible night.
I just ordered some drirelease shorts and tshirt in hopes that the wicking will help with this problem but haven't received them yet. Will that do the trick?
Does anyone else have this problem and what worked for you?
Plenty of places sell sleeping bag liners. Sometimes they are designed to make the bag warmer, other times to be more absorbent. For example, Mountain Equipment co-op sells quite a few, some of which are cotton and mention "absorbency" and "comfort" in their descriptions. I don't doubt that other suppliers offer them too.
I get far too hot but like you I find that layer part of the night gets cold. My solution in temperate climates is to only ever zip the sleeping bag up halfway so the top half is left loose, that way I can pull it over me or off again without waking up.
If it is a wee bit cooler you could try this technique as well as a thin sheet or blanket.