The former One Direction stars were often subject to long stints on the road, and the 25-year-old said the pair used to love doing "something mischievous" after a show, reported Female First.
"I went through a long time, especially toward the last three or four years in the band where I only really stayed on the tour bus. So I wouldn't really do the hotel that often. Sometimes Liam would stay with us, and it would get to like one in the morning, we'd finished on stage and we'd finished the whole atmosphere and we were coming down a little bit.
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