What is wrong with my sleeping habits?

Recently I started taking Lexapro and it makes me a little sluggish but I’m still able to be productive. Only really bad side effect is sometimes I yawn so hard it will take the breath out of me. But my doctor said that’s a know side effect and isn t something to be super concerned about. But lately I have been obsessed with being in bed/sleeping. Literally all day at work all I can think about is crawling in bed and going to sleep. I usually take 0.5mg Xanax at night and watch a little tv or read before going to bed around 8-9pm. My night routine isn’t lavish or anything. So I cannot figure out why I am so fixated on going to bed. I don’t think I’m in a depressive episode, I feel pretty good emotionally. Does anyone else have this problem?