I have so many pressing responsibilities but study after study has shown that if we do not get the proper amount of sleep our brain and body suffers. Lack of sleep can lead to weight gain, stress, simple mistakes, and trouble focusing, to name a few.
I know when I am on a role and my characters are making choices that have to be documented I will lose sleep to get the story written. When I do this, I notice that I suffer throughout the week for the hours that I stayed up. You really can't catch up on your sleep.
Rest is not just sleep but taking time for yourself when you need it. Listen to your body and mind. If you cannot write another word- don't. Take a break, go for a walk, meditate, read, then come back when you are ready.
Sometimes you just need to take a rest from that particular story. Work on your blog, work on another story and then come back to the current one when you are ready. I find that pushing myself to keep working on one story when another one is calling me or when I have hit a road block with the one I am on is detrimental to putting out my best work.
As we continue to work tirelessly through the alphabet haven't you noticed how much you look forward to the rest day? I know I do and that our my minds and bodies telling us how important a break is for our creativity and well being.