The power of physical exercise, that´is why I never understand those people who say they had a cold and miss a training session, your body feels so much better when you exercise it, it´s just natural.
The eye blinking uncomfortably last time that happened to me was because I slept on the ground with almost nothing under me. My body did not relax enough and in the next day my eye was killing me (left eye).
I guess we all have a twitching eye at some part in our lives. I'm glad mines gone though!