Dog barking excessively

Hi everyone, I’m hoping someone might have some advice because I’m starting to lose sleep over this.

I have a one-year-old retriever. From what I know, they’re usually not a very barky breed, which is why I was really surprised when my dog suddenly started barking at every single sound coming from outside our apartment door.

It doesn’t matter what the noise is. Someone leaving their apartment, using the elevator, talking in the hallway, walking their dog on the staircase my dog immediately jumps up, his fur goes up, and he starts barking like crazy.

The funny thing is, it’s definitely not real guarding behavior. If someone actually came into the apartment, he’d probably run up to them with a wagging tail and his tongue out, happy to greet them.

During the day it’s still manageable, but at night it’s becoming really exhausting. Every time he starts barking, it wakes me up. Some nights I wake up even 10 times because of it. Now that it’s getting warmer outside, I tried sleeping with the window open last night and I honestly thought I was going to lose my mind. Because he could hear even more outside noises, he stayed on high alert the entire time.

Has anyone dealt with something like this? Is there anything I can actually do to help him stop reacting to every sound, or is this just something I have to wait out as he matures?