Your mention of motorcycles at 4AM rattled me a little. When drinking heavy (including Sundays) a while back, there were some motorcycle owners that must have worked the early shift and I'd hear them pipes blasting at about 4:30AM and I would wake....then panic because I knew I would have to wake up soon, and I would not fall back asleep. I'll never forget those years.
Funny, now they don't bother me at all really.