For most of the past 25 years I have been working from home - which is a problem because you never leave your work. The main thing that has changed over recent years is that I now take a 1-hour nap around 2 or 3 PM every day, except when I have conference calls that prevent it. After the nap, I feel rejuvenated and productive. I'm sure this is partly related to old age, but I'm also dyslexic and I think my brain needs a rest from struggling with written communications.