When all else fails, check the datasheet. Excerpt attached (see the conditions and the PC - program counter - details).
Re your question about the importance of org 4 when used with sleep - it's of no more importance than when not using sleep; i.e. if GIE is clear, the uC will never jump to addr 4 on an enabled interrupt, but if GIE is set, it will.
To wake up after the ADC conversion is done, make sure the ADIE is set. Note that ADIF will have to be cleared in software.