Uhm :o) well, you have an option: keep him awake and occupied during the day, don't let him sleep a lot. Then, in the evening, play with him a lot more and harder than before. When he is tired, annoy him again. Few days like that, and he should learn when is the sleep time.
If that doesn't...
Hello all!
New here, me and my wife.
Just to introduce our cat: her name is Ruzica (Rosie), she is a mix-up of siamese cat and something from the streets she is beautiful, of course, her hairs are darkish grey on top, but white at the bottom. A bit of green-yellow eyes, nice ears... young...