I never see my husband anymore

My husband graduated college back in May and started a job as a 6th grade science teacher this year. Ever single night he's at the school until 9pm making lesson plans and grading papers. He works 30 minutes away so it's closer to 10 when he gets home. When he gets home he just passes out. We don't eat dinner together anymore because he's constantly trying to get everything done at the school. He has started living off junk food because he's basically working 18 hour days. It's really taking a toll on our relationship because we don't see each other. When he's home he passed out and he's starting to go through a depression from being so tired. I'm hoping someone has some advice.