You have multiple options these days. Nightjet , European sleeper, or the ICE https://www.seat61.com/international-trains/trains-from-Berlin.htm#Berlin-Brussels
Could be cool to team up with people for accommodation as well.
Also if anyone is coming from Friedrichshain I will kindly request to pick me up some hot sauce :)
• scared elephant (sambal) • suicide sauce They have both in the Pfefferhaus 🙏
What do you need?