dark sleeper (plural dark sleepers)
- Odontobutis obscura, a freshwater goby found in East Asia
- 1980, Jiro Kikkawa, Comparative Ecology, translation of original by Yoshiaki Ito, ISBN 0521298458, page 218:
- In these species the eggs are defended most strongly, and feeding territories have also been reported for some of them (the dark sleeper and the common freshwater goby).
- Korean: 남방동사리 (nambangdongsari)