Bluetooth keeps waking arduino

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Hi, I have this project comprised of a node with 2 sensors connected to a main unit wirelessly using bluetooth. I tried to implement sleeping the arduino and wait for a sensor reading to wake it up. Everything worked great until I introduced the bluetooth module. It keeps getting into sleep and then exiting right away. Thanks in advance.

Here is my code:

#include <avr/sleep.h>
#include <avr/power.h>
#include <SoftwareSerial.h>
SoftwareSerial BTserial(6, 7); // RX | TX

int pin2 = 2;
int pin3 = 3;

void pin2Interrupt(void)
{
 
}
void pin3Interrupt (void)
{
}

void enterSleep(void)
{
  
  attachInterrupt(0, pin2Interrupt, LOW);
  attachInterrupt(1, pin3Interrupt, HIGH);
  delay(100);
  
  set_sleep_mode(SLEEP_MODE_PWR_DOWN);
  
  sleep_enable();
  
  sleep_mode();
  
  /* The program will continue from here. */
  
  sleep_disable(); 
  detachInterrupt(0);
}


void setup()
{
  Serial.begin(9600);
  pinMode(pin2, INPUT);
  pinMode(pin3, INPUT);
  ADCSRA &= ~ bit(ADEN); bitSet(PRR, PRADC); 
  Serial.println("Initialisation complete.");
  BTserial.begin(9600); 
  pinMode(12, OUTPUT); //used only to power my sensors//
  digitalWrite(12, HIGH);
  pinMode(11,OUTPUT);
  digitalWrite(11, HIGH);
  pinMode(10,OUTPUT);
  digitalWrite(10,LOW);
  pinMode(9,OUTPUT);
  digitalWrite(9,LOW);
}

int seconds=0;
void loop()
{
  int ss = digitalRead(2);
  int sm = digitalRead(3);
  int s1,st;
  if (ss == 1)
  {
    s1 = 0;
  }
  else
  {
    s1 = 1;
  }
  st = s1+sm;

  if (st>0)
  {
    Serial.println("Trigger ALARM");
    BTserial.write("2");
  }
  
  else
  {
    
  Serial.println("ALL CLEAR");
  BTserial.write("3");
  seconds++;
  
  }


  delay(1000);
  


  if(seconds == 2 && st == 0)
  {
    Serial.println("Entering sleep");
    delay(200);
    seconds = 0;
    BTserial.print("S");
    enterSleep();
  }
  
}