Why am I so tired and sleeping more?

Past 2 weeks I been in engineering school working on getting my bachelor degree. I'm also working 34+ hours as a pharmacy technician. I work and go to school 4 days out the week. If I'm not in school I'm at work and vice versa. I recently started taking naps something I haven't did in forever. My question is why am I so tired I'm not doing anything physically but yet I'm wore out. Why?
Why am I so tired and sleeping more?
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