I usually am in the middle of the bed, but sometimes I lay diagonally across the bed, with my head in the upper left hand corner and my feet at the lower right.
Facing the bed, I sleep on the left hand side.
starboard
Weekdays, my wife sleeps left and I sleep right (closest to the door) - weekends the other way around. Don’t ask.
I sleep on the left side, unless it’s Friday or Saturday night, in which case I sleep on the right - I sleep alone during the week because I work nights, on the weekends I get to sleep with my wife.
I sleep on the right when my husband is home. However, when he is out to sea, I sleep on the left.
Apparently I am ambedextrious.
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Sorry, I couldn’t resist. Actually, the deal is that Kevin has the alarm clock on his side of the bed because he gets up first. When he’s gone, I sleep on the alarm-clock-side.
Jess
I sleep on the left side,
but that’s because it’s the side to the wall,
like to sleep to it.
And then I apperently take to much space in bed,
says Montfort.
So, a new and bigger bed is needed.
On the left, but I’d prefer to sleep on the right. I like to sleep on my left side and sprawl out and hubby likes to snuggle. Sooooo, that means I end up with him breathing in my face and me not being able to stretch out.
I find myself pushing over to the very far left edge, usually dislodging a cat or two, just to get room to sprawl.
I don’t care, but my husband insists on sleeping on whichever side is furthest from the door. He says it’s so the monsters won’t get him first. What a sweetie.
The right.
New Boyfriend hasn’t declared a preference. I don’t think I’ll let him. 
Whatever side is farthest from the door/window. Which here is the left side facing the bed. But here, there’s a door at the foot of the bed that leads up to the Spooky Attic (the house is about 230 yrs old), and there’s a window… but still, I’m furthest from the door.
I sleep on the right, my girlfriend on the left. We can’t sleep well if it’s reversed. If she’s out of town (or I am), I sleep smack dab in the middle of the bed, and rotate to either side. I think it’s more that she needs to be on that side of me, not that I have to be on one side of the bed.
Jman
I sleep on the right side, with my feet sprawled out to the left and center, so I have sort of banished my significant other to the very corner of the left of the bed.
That’s the neat thing about mail order inflatable women; they make so little fuss over bedroom arrangements.
Heh…
Larbord, cuz my hubby is a southpaw-cakchanded-leftie.
and it’s closer to the nightstand where I have to put my glasses.
Kim
Through my relationships, I have slept on both sides of the bed.
Usually on the opposite side of the wet spot.