I woke up two days ago, & my right index finger hurt. What do you think is wrong?

Strain during sleep. General principle: if some ailment occurs after an activity (temporal relationship), then it may very well be-not necessarily-related to that activity. My guess is there was some movement during sleep which caused the problem; perhaps you slept for too long a time in a position that pit undue pressure on that hand. Interesting side issue: stage 5 sleep (rem)- unconscious races, body very still...