I don't see how they could police it. You could carry sleeping kit and argue that it was just in case you couldn't get home in time and you therefore didn't want to have to use another service for the return journey.
I was feeling a bit insomniacic and was just testing that I could sleep.
@snottyotter started
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I don't see how they could police it. You could carry sleeping kit and argue that it was just in case you couldn't get home in time and you therefore didn't want to have to use another service for the return journey.