Keep in mind both of them had been having trouble sleeping lately, making it more likely they'd fall into a deep sleep and not move all night long. I've done that before (slept 12 hours straight once, woke up in same position I fell asleep in), and even on normal nights I don't move between the times I wake up and roll over to the other side. I do usually wake up two or three times and roll over, but I'm awake enough to not knock a phone off the bed when I do.