when i set an item in session storage, (then refresh the page) and then set a variable as the item, for some reason it sets that variable as either NaN or null, how can i stop this? (save files)

    var myVar = false;

function save() {
    sessionStorage.setItem("myVar", myVar)
}

function load(){
    myVar = sessionStorage.getItem("myVar")
    myVar = parseInt(myVar) //is supposed to set myVar as the stored variable called "myVar"
    //if i do console.log() and print the variable value, it either shows up as NaN or Null
    //if i didnt do 'parseInt' then the value will be 'false', but the value is in strings???
    //(when value is in strings, it wont work in an "if (myVar == false){}")
}