A 36-year-old Janesville woman is facing a charge of Operating While Intoxicated 4th Offense after being found asleep early Monday morning in a fast-food drive-thru.  Janesville police say Amanda R. Calkins was found asleep at the wheel about 12:15 a.m. at the McDonald’s on Center Avenue.  Officers say she displayed signs of impairment and was arrested after submitting to Standardized Field Sobriety Tests.  Calkins was also arrested on charges including possession of THC, a probation violation, and warrants in both Winnebago and Rock counties.