Does your town have a great big old public library with lots 'o nooks and crannies and dark bookstacks that people don't go back into much? Always a winner, if you've got one around.
Not to be sacriligeous, but do you have any access to a church? They're pretty empty, six days a week.
You can always get a sleeping bag rated for zero degrees or lower, double-sized. It'd work -- you can get two people completely inside one of those things, heads and all. Body heat does the rest. It'll actually work, but it's gonna cost ya.
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