Why they cut water supply in nights in college hostels?

I'm living in uni hostel and I'm so frustrated of this, management cut water supply from 9 pm to 6am and I'm an eary bird I wake up around 5 every Morning and I need to freshen up suddenly after waking up, and there is no water available either you should have to arrange or need to make reserve 🙃 Have you faced or facing same? If you have some hacks let me help...