Moving by Train Always Makes Me Drowsy

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Oct 7, 2017 10:29
I wonder why I always get sleepy while moving by train.
I'm not sure, but the periodic sound of a train like "Clickety‐clack" may cause drowsiness. Actually, I would like to study English during this travel time, but sleep always overcomes me.
It is very difficult for me to make use of my time effectively.

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