I am a nurse working 12 hr. shifts at night. When I began my current job my hiring boss allowed me to work 8 hr. nights on Saturday night, then two twelve hour nights Sunday and Monday. So I was always able to observe Shabbat because I didn't have to work until 11pm on Saturday night. Then that manager retired. Since then the eight hour shifts were eliminated. I must be off Tues. nights to prepare for lessons on Wednesday nights as I teach Hebrew school on Wednesdays. I requested to be off Tues, Weds, Fri, Sat. I was told I could have either Fri night or Sat. night off but not both. Since I am a nurse- and sick people don't take "time off", then as another Jewish friend reassures me, am I doing "divine work?" I happen to be Reform. I chose Fridays off so I can usher in Shabbat, but have to be at work by 6 pm on Saturday. What does Judaism say about this situation?