16F88 Wake from SLEEP on Port B change?

  while(1)
  {
    swnew = portb;                // clear mismatch condition
    intcon.RBIF = 0;              // clear IOC interrupt flag
    sleep();                      //
    nop();                        //
   /*                                                                 *
    *  swnew  ____---____-----___    new switch sample                *
    *  swold  _____---____-----__    switch state latch               *
    *  delta  ____-__-___-____-__    changes, press or release        *
    *  newhi  ____-______-_______    filter out new release bits      *
    *                                                                 */
    delay_us(16);                 // 16-msec debounce interval
    swnew = ~portb;               // sample active lo switches
    swnew &= 0x0F;                // on RB3..RB0 pins
    swnew ^= swold;               // changes, press or release
    swold ^= swnew;               // update switch state latch
    swnew &= swold;               // filter out new release bits
  
    if(swnew.0)                   // if sw0 (RB0) pressed
    {                             //
      ....                        //
    }
    if(swnew.1)                   // if sw1 (RB1) pressed
    {                             //
      ....                        //
    }
    if(swnew.2)                   // if sw2 (RB2) pressed
    {                             //
      ....                        //
    }
    if(swnew.3)                   // if sw3 (RB3) pressed
    {                             //
      ....                        //
    }
  }