2 Months Ago I Was Diagnosed With Depression And Have

2 months ago I was diagnosed with depression and have been in lexapro since. For several weeks now Ive been getting maximum of 4 hours sleep a night. I work sjift work (changing from 6am-2pm and 2pm-10pm everyweek) which doesnt help. I cant stick to one shift in work or lose my job as Im only 19 and I need the money for college. Is there anything that could be prescribed to me to help with my sleep?