1. Quantity kills quality

2. Sleep matters

3. You suck when it counts

4. Your mood is a buzzkill

5. Your judgment is impaired

6. You’re setting a bad example

7. There will always be more work

8. You’re hurting your relationships

9. You’re screwing up your health

10. Most of the work is less important than you think

From: 10 Reasons to Stop Working So Hard | Inc.com.