Summary:

- Researchers have discovered the amino acid tryptophan, which is known to make people feel sleepy, in an asteroid sample. This is the first time tryptophan has been found in an extraterrestrial source.

- Tryptophan is an essential amino acid that the human body uses to produce serotonin, a chemical that helps regulate sleep and mood. Finding tryptophan in an asteroid suggests that the building blocks of life may be more common in the universe than previously thought.

- This discovery provides clues about the chemical composition of asteroids and could help scientists better understand how life may have formed on Earth. It also raises the possibility that tryptophan and other organic compounds could be present on other planets or moons, potentially supporting the existence of life elsewhere in the cosmos.