hehe, u are reporting exactly opposite complaint!but a rule or guideline will solve both our problems.For 1st case. You have to consider others. Where will they seat if u want to sleep in day time? Because sitting in middle or lower berth is highly inconvenient because u have to sit with bent back.For 2nd case u can ask middle guy to come to ur seat. Since both of you have problem, i suppose both will understand mutually. U get fan. He gets to keep window closed.2nd and 3rd are more or less 1 and same issue.