Adjusting light cycles can absolutely be done, but just be aware that there can be some unforeseen circumstances from creating an abnormal light cycle relative to the season. Animals, including snakes, can feel subtle changes in barometric pressure and other physical parameters. I know from personal experience that cycle shifted lab animals display strange behaviors when their light cycle doesnt correspond at least somewhat with nature. Sure you can play a little bit with sunup/sundown, but I would never completely shift them to having lights on only when it is dark outside.
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