.....and yes even on your boat if a crew person goes to bed in the forepeak the sailing characteristic will change
Not much, but it will.
Maybe when the people go to bed in my forepeak they drink some of the water out of the under-berth tank to compensate??
Oh, no that wouldn't work because the water would still be up front.
Nah, I never feel any difference in my boat no matter how many people are moving around it. Maybe I'm just insensitive. I still reckon 50lbs should never make any difference to the balance of a 12000lb boat. Maybe on a Radial Laser . . . . .