I had a friend who did that, and would nap before class. Seems like it'd work out better, however, if the shift could end more at like 7, and if you'd start later (so you could sleep early in the evening). If you don't have to take a shift like this, though, (like if you live with parents still, and you aren't in major debt) I would recommend looking for something more school-friendly.
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So when you're happy (Hurray!), or sad (Aw!),
Or frightened (Eeek!), or mad (Rats!)
An interjection starts a sentence right.