I have the same hair type, same color, and have suffered from the same issues, so I can share what worked for me.
-Stop Brushing It. Brushing hair causes it to secrete grease, or natural oils, brush it once a day, and steer clear from touching the top of your head as well, as any dirt or oils on your hand will transfer to your hair.
-Avoid using detanglers, ...
I suffer from bed-head to, and the best solution I can offer is to run it through with a wet comb, so it gets "damp" but not wet, then let it air dry.
@axsvl77 had a good solution as well, though I have not tried it.
My last few solutions are less concerned with your hair and center more around your environment. (All my suggestions below were/are ...
Certain shampoos strip moisture from hair, and I don't see anyone pointing out that the shampoo may be part of the issue. Head and Shoulders is especially stripping of moisture, though there are many offenders.
I can recommend a few shampoo/conditioner sets that can help combat this dryness.
-Organix Moraccan Argon Oil (is a set)
-Really any Organix product (...