A brief nap taken to restore a person's energy before attending a nightclub or late-night party; (hence more generally) any brief restorative nap, a power nap.
Origin
1990s; earliest use found in New York Newsday.
Definition of disco nap in US English:
disco nap
noun
North American
A brief nap taken to restore a person's energy before attending a nightclub or late-night party; (hence more generally) any brief restorative nap, a power nap.