Ah, cataholic beat me to the "how about another cat" suggestion. Seriously, if he is younger, changes are he is bored bored bored. Cats are often best in pairs. Whenever the rescue I volunteer for adopts out kittens, we suggest they do two kittens, and we even offer a "two for one" special so that the cats have someone else to entertain them and keep them company.

Outside of that, a good hour of intense play before bedtime should help cut back on that. They want attention, and lots of it. So ignoring or shutting them out isn't helping, or making the issue go away -- it creating more lonliness and boredom. A bored cat is a very BAD cat. They start scratching in inappropriate places, create monsterous messes, etc.

PS: Welcome to PT! I hope you find it a wonderful place to visit and come back with pictures of your little guy!