4 weeks PP. Major milk supply dip?

Is there any reason for a sudden milk supply dip. The only change that I have made is that last night I only got like 3 hours of sleep and it's been a bit of a long week I pushed it a bit more then I should have with cleaning and carrying around toddlers.

I make sure to drink plenty of water usually I struggle with the oversupply so all the sudden feeling like I'm drying up out of nowhere is crazy I have no idea what to do. I have been feeding on demand and he never goes longer than a 2-hour stretch of sleep so I really don't know why my body just stopped making milk 😥