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Most airlines will allow you to get your bags during a long layover, but to be sure you should call the airline directly and ask including all your specific flight information (flight times, fare class, status, etc.)
However, if possible, I'd use carry-on for the layover. You'll be out of the airport a lot faster, you can come back to the airport later (since you don't need to re-check bags) and you don't need to schlepp your bigger bags around. Most carry on will easily accommodate a day/night pack.