I've recently discovered a downside to working on my own business. I'm pretty much working on computer programming projects 12 to 14 hours a day, 7 days a week, with a short 2 or 3 hour break on weekdays for my karate classes. I'm enjoying the work, which is why I'm voluntarily working this much, but I'm beginning to think this pace isn't mentally healthy.
The last few nights I've found I have been having a harder and harder time getting to sleep. Instead, I lay in bed with my mind racing to solve programming problems. Last night was the worst - I laid in bed for about 5 hours before I finally fell asleep.
I definitely need to cut back on the time spent programming and give my mind a break. I think I've taught my mind to concentrate so much on programming that that's all its in the habit of doing now.
This just reemphasizes a lot of the principles of Zen. It's my brain, yet I seem to have so little control over it. Gotta get back on track with that...