Do you use a serum/leave in conditioner in your hair?

Okay so for some reason I wake up every morning with disgusting bed head hair. It seems normal, but I never used to wake up like that. My hair is always matted and I try to brush it and then it ends up dry and disgusting looking. It's actually hard to brush and seems like my hair always has tangles.  I've tried creams, I don't wash my hair everyday, I get trims regularly, I do what I'm told to make my hair healthy... Maybe thinking its from bleaching my hair and then redying it because it looked awful...? but that was over three months ago. I don't know what to do because it's always gross looking now.