Dog
Dogs function as involuntary social networking devices. Research published in PLOS ONE demonstrates that dog owners engage in 300 percent more conversations with strangers than non-owners during equivalent outdoor activities. The dog provides conversational pretext, a neutral topic that permits interaction between individuals who would otherwise maintain British-standard social distance.
Dog parks represent communities that form exclusively around shared animal ownership. Humans who differ profoundly in politics, profession, and personality discover common ground through mutual appreciation of a golden retriever's unsuccessful squirrel pursuit.
Sleep
Sleep provides social benefits exclusively through its aftermath. A well-rested individual demonstrates improved emotional regulation, enhanced social cognition, and reduced irritability, traits that correlate strongly with relationship satisfaction. Research indicates that sleep-deprived individuals exhibit decreased capacity for empathy and increased likelihood of interpersonal conflict.
However, the act of sleeping itself is fundamentally antisocial. It requires withdrawal from human contact, the assumption of vulnerable horizontal positioning, and the cessation of all communication for extended periods. Sleep improves one's social capacity precisely by removing one from society.
VERDICT
Sleep improves social function indirectly. Dogs create immediate social opportunities that well-rested antisocial behaviour cannot generate.