I try not to look at any screen -- phone, tv, computer -- before I get into bed. I'm not always good about it, but I find that it helps calm my brain. Something about the bouncing from topic to topic that makes it hard to calm down, whereas reading doesn't seem to effect me the same way.
I also find that a good conversation with DH relaxes me; we often talk for about 20 minutes, even about 'nothing', before turing off the light, and this really helps me too.