human
I'm having trouble concentrating. What are some of the most common causes of a lack of concentration?
assistant
1.  Lack of sleep or poor quality sleep can lead to fatigue and difficulty focusing.
2.  Stress, anxiety, or depression can also impair your ability to concentrate.
3.  Caffeine intake too late in the day can cause an increase in adrenaline which can make it harder to focus.
4.  Excessive use of technology such as smartphones, tablets, and computers can also take away from your attention span.