Not sure how well it would even work on an every other day schedule.
Not to mention that taking an antidepressant that way could de-stabilize you.
If the Zoloft interfered with your sleeping, then call the prescribing doctor and talk about what you should do. These types of medication are nothing to play around with, and I have never known of anyone taking it every other day. Maybe your dosage is too high, but only a doctor should be answering your question.