Your long hair looks dishevelled and entangled when your wake up in the morning. So you should never comb out your hair in a hurry to disentangle it , otherwise ,it will lead to hair breakage. Try to disentangle your hair with the help of your fingers slowly .See how you hair disentangles in no time. Remove all the knots before combing your hair.
Use long hair brush for combing out your long hair keeping in mind that brush should be made of woods and bristles should be soft. Use a wide toothed comb for long and thick hair.