Break out the Panic Button, NatsTown.
According to the Washington Times, the neck injury was suffered while he was sleeping (let's cut and paste from Chatter):
According to an AFL official, Strasburg woke up Wednesday morning with neck stiffness. This morning, he was examined by a doctor, who diagnosed it as a strained muscle. It doesn't appear to be anything serious, though obviously you never really know until the player returns to the field.
This is unacceptable. Time to fire Strasburg's goddamn pillow.