I know!,their curfew is sundown and the cat flap gets locked so they can't get out once they're in, but cos I work evening shifts sometimes, DH is a bit slack, and gets home late, so its a bit random about when they come in. I feel mean locking them in when I leave at 2pm esp in summer, but I did do that last year, have just slackened off a bit lately, they're OBSESSED with being outside and frank has been known to escape out of a locked catflap somehow lol.
He'll be fine thanks for your concern, he's not even off his food or anything, so probably got it early!