With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Sleep can be disrupted by REM behavior disorder.
text_B: Once a Thief -LRB- also billed as John Woo 's Once a Thief -RRB- is a Canadian Action / Comedy television series inspired by the Hong Kong 1991 film of the same name .. Action. Action ( genre ). Comedy. Comedy film. Once a Thief. Once a Thief ( 1996 film ). 1991 film of the same name. Once a Thief ( 1991 film ). The series is a continuation from the 1996 television film of the same name and it also includes two direct-to-video sequels  : Once a Thief  : Brother Against Brother and Once a Thief  : Family Business .. Once a Thief. Once a Thief ( 1996 film ). 1996 television film of the same name. Once a Thief ( 1996 film )
not_related.