Martha's the one who freezes instead at the unexpected intimate touch, ducking her head with an uncharacteristic shyness. "I just, you know, I was asleep, and I must've been confused, that's all." God, of all the people to snuggle up to in her sleep, it had to be the Doctor.

Though it's probably better than waking him up with nightmares, if only because then she'd have to explain.

"I. Er." She settles back down into the bed instead of trying to worm her way down the sheets and out the foot of the bed. "Sorry." She said that already, didn't she?