Will I ever be able to sleep through the night with addisons?

Absolutely. Because your adrenals are not quite up to par, your hormone levels are a bit off, which means that your "sleep architecture" is disrupted. But if you sleep in the dark (including night lights), turn off all electronics well before bedtime, take a warm bath before bed, keep the room temperature down, clear your head of intrusive thoughts, and maintain a regular sleep schedule, you should be fine.
Yes. If properly treated, you should have no problem with sleep with addisons. Follow your doctor's instructions. Don't overdo the steroids.