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Nov 18, 2018 at 8:26 comment added Chris H @DonBranson, that's an extreme case. You'd need a lot of condensation to wet the sleeping bag (and it would have to actually wet it to reduce the insulation, mere humidity would have very little effect). As most tents have some ventilation in the inner, you shouldn't reach this point in normal use.
Nov 18, 2018 at 4:16 comment added Don Branson "The tent will definitely be warmer because it keeps the wind away." Ray Jardine claims that over time, a bag in a tent will gain moisture from peoples' breath, such that it's actually warmer in the long term to sleep under a tarp because the increasing moisture from being enclosed in a tent decreases the effectiveness of the bag. That is, the wind over the bag maintains the effectiveness of the bag in the long term.
Nov 18, 2018 at 1:45 comment added Makyen The OP also has not mentioned what type of pad/insulation they had underneath them (i.e. between the sleeping bag and the ground). The insulation used there can make a significant difference in the temperature experienced by the person in the sleeping bag.
Nov 17, 2018 at 21:47 history answered Charlie Brumbaugh CC BY-SA 4.0