Eight - year - old boy was bitten after being bitten during ' sleep ' In it boy 's nose and mouth are held shut by another until they pass out . Police in Manchester are concerned that ' sleeper ' prank is potentially fatal . police says craze should be stopped before ' we have a terrible tragedy '
Eight-year-old boy was hospitalised after being suffocated during 'game ' In it child 's nose and mouth are held shut by another until they pass out . Police in Manchester are warning that 'sleeper ' prank is potentially fatal . Councillor says craze must be stopped before 'we have a terrible tragedy '