Is it normal my wife likes to fall asleep holding my ...

We do the same. I hold one of tits and she will hold my cock sometimes. No better way to fall asleep.

It's a shame that she didn't have Parkinson's then you'd get a free wank into the bargain. But seriously if your not comfortable with this habit, ride her arsehole a bit before going to sleep, but be crafty, put a bit of pepper on your bell end. That way she'd be more inclined to be scratching her sore arse that hold your tackle. Think outside the box buddy.

Same here. And if she's spooning me instead, she'll often hold my stuff.