What’s going on in Zaragoza at night?

Hi everyone, I need some help understanding what’s happening. Zaragoza is a beautiful and safe city, and I’ve been here for a week. However, every night when I return to my hotel on Calle del Coso, I hear people screaming like crazy between 04:00 and 06:00. It’s incredibly loud—even though I’m on the 7th floor, I can hear them clearly.

This isn’t just a weekend thing; it happens during the week too. How is this allowed? I’m from a big, noisy European city, but even in the busiest university areas, this kind of disturbance wouldn’t be tolerated.

Is this normal here?