Could you survive in the desert?

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Last night we were watching a movie about two people that got stranded in the dessert. They ended up walking for days through scorching barren terrain. And, I was wondering the entire time, why they didn't simply wait until night time to travel. From what I've heard, it's much colder in the desert at night. Of course you'd have to deal with the critters and animals in the desert. But, it's not as if lions live in the desert, unless you're in Africa. And, most lizards can't kill you. So, I think I might have a small chance of surviving in the dessert. But, at least a slim chance is better than none. What do you think? Chances are, I'd run out of water (assuming I had any) before any major rescue attempt could occur. But, I would certainly go down fighting every inch of the way. What about you? Do you think you would survive if you got stranded in the desert?