Our expert says:
If the tomcat is not castrated this may help, but keeping him in at night is probably still the best thing. It is not a punishment, but a way to prevent him getting injured or causing a nuisance. It won't hurt the other cats to keep them in as well, as long as they have a litter tray to use inside. If he sleeps all day, this is quite normal for cats as they do sleep a lot. He may become more active during the day once his routine is more settled and he is less active at night. Try to cheer him up with catnip, toys to chase and interesting treats.
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