I think it has a meaning. Remember whenever the red balloon comes somewhere near Simon he feels tired and unable to make a move. In the beginning of the movie the red balloon came very close to him when he was in the train and even though he wanted the red balloon as we know it from the very beginning, he did not make a move and he appeared tired and unwilling. Again, when he was in bed we see that the red balloon actually came to visit him. Assuming the red balloon symbolises freedom and liveliness (it flies wherever it wants to and it is red), he is too tired to have it because he is a sad and lonely boy.
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