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If the cold is a problem at night, and if peeing at night means crawling out of your sleeping bag and exposing yourself to even colder air outside the tent to get it done, then it totally wouldn't be worth it to me. Especially when you consider that you're going to have to 'reheat' your bag by the time you return.
Wear and extra shirt/sweats.
My inclination is no, it doesn't make any difference for the reason you stated. The liquid has already been heated, and if anything holding it will work better to keep you warm because the added heat reservoir in your bladder will be more total volume to cool, before you die of hypothermia.
What may help, if you're not already dehydrated is abstaining from water/cold foods which would cool your core when you eat/drink them.
As for the house, in a house you heat the air, which is also what your thermostat measures. So, in theory a fuller house has less air to heat, as for heating the stuff in the house, the more stuff the more it takes to heat it. I don't know that this is answerable for certain without considering what the house is filled with.
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The advantage law is the best law in rugby, because it lets you ignore all the others for the good of the game.
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