If power is coming into this box and then on through to the other switch you can tap off no problem. There are about 6 different ways to wire a 3 way cct, it's best to know how yours was done before you start jumping wires.
You should have a 2 wire coming in, that would be your supply. The black and white from the 3 should be tied to this. the red should be capped. If you have more wires in there than there is another draw on the cct. If you tie your nitelight to the supply line you shouldn't have any trouble. If you have another black in there you need to know what it does.
By suited I am assuming you have a suite now. Code is for all electrical in a suite to be on it's own panel, so you would be contravening code by doing this.
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