Bash Shell Simple Stop/Start Signal Handling

#!/bin/bash 
declare -i i=0
declare SLEEP_FLAG=1
builtin trap '{ SLEEP_FLAG=1;while :;do ((${SLEEP_FLAG}))&&sleep 1||break;done;}' TSTP
builtin trap '{ SLEEP_FLAG=0;}' CONT ## Why don't all shell scripts do this?? 
builtin trap '{ echo -en "\nUseful addition to a shell script that may run for a while.\n";exit 0;}' INT 
clear 
while :; do 
 i+=1
 if ((${i}%7==0)); then 
  echo -en "** Warning: file system is getting full ... ${i}" 
  sleep .5
  clear
 else
  echo -en "looping around ... ${i}" 
  sleep .25
  echo -en "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r" 
 fi 
((${i}==75)) && echo "Sending SIGTSTP to myself! To restart me \$>kill -SIGCONT $$" && kill -SIGTSTP $$
done
exit 0