Owen's been having them for a couple of weeks. He's had trouble getting to sleep, too, but the night terrors are getting BAD lately, like every half hour till 2-3am. (Of course I wake up w/each one...

) How long do they usally last--weeks? Days?

Years?
Also, sometimes if we're away from home, he'll wake up screaming at night or after a nap and the ONLY thing that will calm him down is to go home. Is this normal for being 2y3mo old? Or is there some deeper issue here, like being displaced from his foster home to another home in Guatemala (w/me) to his forever home? (I'm probably overanalyzing again...)