Need Suggestions for Balancing my Life

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I'm a newlywed, a full-time nurse supervisor, and I'm in school part time for my MSN in nursing education. I'm feeling a bit overwhelmed with all the responsibilities I have set before me. I currently feel especially inadequate about being a supervisor because I want to focus on school. I also feel behind on sleep. Any suggestions on sleeping better at night, finding the motivation to exercise early and balance my life?