While I understand the sentiment, I think the daylight is going to be just as rough as any night can be. Think about the story line, last remaining human city on Earth and a multitude of alien life trying to finish the job it started. Every place you go has a chance, regardless of being in a group or solo to run into a mob you just dont have a big enough gun for.
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either way the night might be more dangerous restricted sight and stuff like that unless you get night vision or flashlights