Live wire running through entire apartment wall?
Screw into studs, not drywall anchors, for something heavy that will be above your head while you sleep!

If you're worried about shorting the circuit with your screw, turn the breaker off first.

Measure voltage between hot, neutral and ground, and make sure its 0.  Then measure resistance, and write down what you find.

Then try to make sure with the stud finder that you're screwing directly into the middle of a stud.  It is then, very very unlikely you will hit the wire.  Especially 4-5 feet above the floor!

Once the screw is in, measure resistance again and compare to what you wrote.

If you see a significant change in resistance (>2%) then you might have hit the wire with your screw, and should take steps to repair from it.  You could disconnect the outlet in the overhead's junction box, or you could cut open drywall and replace the wire.

But more than likely you will measure no change in resistance, and can turn the breaker back on with confidence that you're OK.