Does anyone know if doctors on shifts like this are given ample breaks to peruse polyphasic sleep? A 24-28 hour shift with 3-5 hours of polyphasic sleep doesn't

Does anyone know if doctors on shifts like this are given ample breaks to peruse polyphasic sleep? A 24-28 hour shift with 3-5 hours of polyphasic sleep doesn't seem quite as bad as just staying awake for 24 hours+