While in sleep mode, the only critical parameters to handle are the RAM and register contents. On AVR microcontrollers these contents are valid until ~0.3V Vcc, while the AVR’s Power-on Reset (POR) triggers at ~1.0V.  If a power supply voltage drop should occur while in sleep mode with the BOD disabled, the SRAM and register contents will be valid until a POR occurs. A POR will enable the BOD again and set the POR flag to be read by the application firmware. The BOD disable feature completely eliminates any power consumption penalty for the BOD during sleep mode and the MCU has full protection in active mode.