I live in a multi-storey house on the middle floor, when I get up early at work, I go to wash and pour cold hot water overnight for a long time. One day I noticed that the upper-floor neighbor was waking up a little later than me and my brain and hands moved the alarm clock 10 minutes later than usual. I started to sleep 10 minutes longer and wash with hot water. The neighbor also began to guess about the hot water and began to wake up later on. So we switched the alarm clocks until he and I were specifically late to work.
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