If you’re reading this, congratulations — you’ve unlocked the secret level called new parent sleep deprivation. No one tells you about this in the baby books, but trust me: it’s basically like pledging a frat, running a marathon, and working the night shift at Waffle House all rolled into one. Let’s walk through the hilarious (and slightly horrifying) stages of new parent sleep deprivation so you know what’s coming — or, if you’re already in it, so you know you’re not alone. Stage One: The Hero Phase of New Parent Sleep Deprivation At first, you think: We’ve got this! You’re tag-teaming feedings, your partner is cheering you on, and you…