Pretty much, if I don't want Wyn to play with something, I have to be conscious of where I put it. It's like having a toddler: they'll grab at anything. Cat-proofing your house is much like baby-proofing it and, unfortunately, it needs to be done regardless of inconvenience.
Just this past weekend I had to move a 6'+ bookshelf because Wyn discovered how to get onto the tv and then onto the shelf. Then she couldn't get back down from the shelf. As much as it sucked (and the shelf is heavy) I saw no other option.
Your cat is young. He's still a kitten. He's going to try and knock things down. I know that probably doesn't make you feel better about it and it makes this difficult, but it's kind of just how it is, I think.
And I don't mean to sound harsh, because I know that this is upsetting to you, but pets change a person's normal way of life. When you take a pet into your home, you really have to expect anything to come up and I admire that you've taken the steps (asking on this forum) to try and understand your cat. That's important. A lot of folks just get rid of "problem" animals and that's hard on the pet.
I agree with others that have said that your baby might be a little lonely and that's why he's crying, especially since he does it at night. Cats are nocturnal animals (as I found out the hard way, myself) and that's usually when they're the most active. Humans have to help a kitty adapt to sleeping at night and playing during the day.
I hope the forum helps you. I know it's been invaluable to me. Good luck!
Wyn is a bad, bad kitteh. Good thing her person is a bad, bad girl... They get along great!