getSleepHours = day => {
  switch (day) {
    case 'Monday':
      return 8;
      break;
    case 'Tuesday':
      return 7;
      break;
    case 'Wednesday':
      return 6;
      break;
    case 'Thrusday':
      return 5;
      break;
    case 'Friday':
      return 4;
      break;
    case 'Saturday':
      return 3;
      break;
    case 'Sunday':
      return 2;
      break;
  }
}

getActualSleepHours = () => getSleepHours('Monday') + getSleepHours('Tuesday') + getSleepHours('Wednesday') + getSleepHours('Thrusday') + getSleepHours('Friday') + getSleepHours('Saturday') + getSleepHours('Sunday');

getIdealSleepHours = (idealHours) => {
	return idealHours * 7;
   }

calculateSleepDebt = () => {
  const actualSleepHours = getActualSleepHours();
  const idealSleepHours = getIdealSleepHours(5);

  if (actualSleepHours === idealSleepHours) {
    return 'You are getting the perfect amount of sleep.';
  } else if (actualSleepHours > idealSleepHours) {
    return 'You are getting more sleep than needed. You can sleep ' + (actualSleepHours - idealSleepHours) + ' hours less.';
  } return 'You should get some rest. You need to sleep more ' + (idealSleepHours - actualSleepHours) + ' hours per week.'
}

console.log(calculateSleepDebt());