Napping after overfeeding on food is a dilemma many of us will be fortunate to face on Christmas Day. New research has shown that, billions of years ago, some early black holes also had to nap after overindulging.

Using the James Webb Space Telescope (JWST), astronomers spotted a dormant supermassive black hole that existed just 800 million years after the Big Bang. This cosmic monster passed out after a particularly large meal of galactic gas and dust.

The black hole is extraordinary for its monstrous size. With a mass around 400 million times that of the sun, it is the most massive black hole seen by the JWST in the early universe. The discovery, published on Wednesday (Dec. 18) in the journal Nature, further complicates the mystery of how supermassive black holes got so massive so quickly in the early universe.