Late-Night Snacking Spree

I've been getting this weird craving at midnight. It's like my body knows I’m asleep but my taste buds are on a sugar high! Last night, I raided the fridge for everything sweet and salty, think chips, chocolate, cookies, and ice cream. My roommates probably think there’s some sort of snack apocalypse going down in our kitchen, but it's just me craving all-night munchies. Anyone else deal with this? Is this totally normal or should I be concerned?