Issue with bods attiny85 attinycore

Using Arduino Microcontrollers
1 
#include <avr/sleep.h>
#include <avr/power.h>
#include <avr/wdt.h>


EMPTY_INTERRUPT(ADC_vect);
EMPTY_INTERRUPT(PCINT0_vect);
EMPTY_INTERRUPT(WDT_vect);

void Sleep() {

  noInterrupts();                       //Before Sleep Enable
  MCUSR = 0;                            //Clear Flags
  set_sleep_mode(SLEEP_MODE_PWR_DOWN);  // Select Sleep Mode
  sleep_enable();

  WDTCR = (1 << WDCE) | (1 << WDE);  // Enable WDT change
  WDTCR = 0;
  wdt_reset();

  MCUCR = bit(BODS) | bit(BODSE);  // turn on brown-out enable select
  MCUCR = bit(BODS);               // this must be done within 4 clock cycles of above
  interrupts();                    //
  sleep_cpu();
}  

const byte ledPin=1;
void setup() {
    MCUSR = 0; 
    WDTCR = (1 << WDCE) | (1 << WDE);  // Enable WDT change
 WDTCR = 0;
   
 pinMode(ledPin,OUTPUT);
}

void loop() {
 digitalWrite(ledPin,HIGH);
 delay(500);
  digitalWrite(ledPin,LOW);
 delay(500);
 Sleep();
}

keeps on waking
but with the two BODS lines commented out, the attiny85 sleeps properly.
brownout enabled 1.8v in bootloader.
anyone know why this would happen?
thanks

2

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