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b1gj1m304 , having read your introduction thread, I lean towards it not being worth it, in your instance. Factoring in the lack of sleep, stress on your family life, and the small pay checks which will quickly be eaten up by your added fuel costs and wear & tear on your clothes, not too mention union dues (unless you're in a "right to work" state). The big plus would be the benefits, but unless you're in New England those don't kick in for a year; and you said you're already well covered.
Having said that, you could go ahead and try the seasonal position out, stressing to HR & your supervisors that you'd like to get hired onto the Twilight shift. My recommendation would be to try to get an unloader or primary sorter position; but loaders are in highest demand and that's where most new hires are placed. Once you've made permanent seniority there is some provision in the union contract to change positions, but the language/enforcement doesn't seem to be very good in general, from what I've read here over the years. Unloaders/sorters are the first ones to finish working, and as long as you're not ordered to go help elsewhere, you'd get home sooner. Around here they typically work between 5:30-9:00 PM most of the year. After a few raises (years) the paychecks are better, and if you average 15 hours/week that gets you almost all the benefits.
The work itself is as much mental determination as it is physical labor/skill.
And who knows, maybe you'll decide you want to try your hand at FT package delivery driver, knowing you won't be making a career of it or getting any significant pension from it.
And by the way, the most productive loader I ever worked with was a 50+ year old guy, who had previously worked as a loader in the 70s (so long ago there was no record of his previous employment hence there was no "no rehire" status).