Nocturnal Nuisance is a term used to describe two creatures that are active at night and can be a nuisance to humans. The first creature is a SNORER, which is a person who makes loud noises while sleeping due to the vibration of their soft palate. The second creature is an OPOSSUM, which is a marsupial native to North and South America that is known for its scavenging habits. Both of these creatures can be a nuisance to humans, especially when they are active at night.