Generate interrupt with PWM signals from RC receiver to Arduino

Hi, I want to do led control through arduino with RC receiver and transmitter. RC receiver generates PWM signals. I can capture these PWM signals with pulseIn command. At the same time I want the arduino to consume less power. Therefore, when I switch from my RC transmitter, I want to trigger the RC receiver and get out of Arduino sleep mode.

However, the RC Receiver produces varying signal values.
Namely:
Switch off mode: pulseIn function output: 1082 1076 1083 1083 …
Switch on mode: pulseIn function output: 1909 1915 1916 1915 …

Arduino comes out of sleep mode directly because it produces varying values in this way.

I can switch Arduino without sleep mode.

In short, how do I get Arduino out of sleep mode correctly with PWM signal.

#include <avr/sleep.h>

#define rcGiris1 2 // RC receiver to Ardino Nano digital2 pin (interrupt 0 pin)
#define ledCikis1 7 //led
unsigned long number;

void setup() {
  //  pinMode(kesmePin, INPUT);
  pinMode(rcGiris1, INPUT_PULLUP);
  pinMode(ledCikis1, OUTPUT);

  Serial.begin(9600);
  attachInterrupt(0, uyan, CHANGE);

}

void uyan()        // here the interrupt is handled after wakeup
{
  number = pulseIn(rcGiris1, HIGH);


  if (number < 1300)
  {
    digitalWrite(ledCikis1, LOW);

  }

  else
  {
    digitalWrite(ledCikis1, HIGH);
  }


  Serial.println(number);
}
void uykuMod() //WAKE MOD
{
  /* The 5 different modes are:
     SLEEP_MODE_IDLE -the least power savings
     SLEEP_MODE_ADC
     SLEEP_MODE_PWR_SAVE
     SLEEP_MODE_STANDBY
     SLEEP_MODE_PWR_DOWN -the most power savings
  */

  set_sleep_mode(SLEEP_MODE_PWR_DOWN); // sleep mode is set here

  sleep_enable(); // enables the sleep
  /*
    power_adc_disable();
    power_spi_disable();
    power_timer0_disable();
    power_timer1_disable();
    power_timer2_disable();
    power_twi_disable();
  */

  /* In the function call attachInterrupt(A, B, C)
     A   can be either 0 or 1 for interrupts on pin 2 or 3.

     B   Name of a function you want to execute at interrupt for A.

     C   Trigger mode of the interrupt pin. can be:
                 LOW        a low level triggers
                 CHANGE     a change in level triggers
                 RISING     a rising edge of a level triggers
                 FALLING    a falling edge of a level triggers

     In all but the IDLE sleep modes only LOW can be used.
  */
  attachInterrupt(0, uyan, CHANGE);
  Serial.println("uyudu");
  sleep_mode(); // here the device is actually put to sleep!!

  // THE PROGRAM CONTINUES FROM HERE AFTER WAKING UP
  sleep_disable(); // first thing after waking from sleep:
  detachInterrupt(0);
  Serial.println("uyandi");

}


void loop() {


  Serial.println("loopta");
  delay(5);
  uykuMod();

}

Hi,something came to my mind . Can we change the CHANGE parameter sensitivity? can someone help?