I used to imagine I was reading so I could sleep faster. It was such a sleeping pill that just the thought of reading made me drowsy.
It takes some time until your distracted mind can focus on the subject matter. The harder the reading is, the more time it takes.
You also need to form a habit of reading in general. You should also sit somewhere and not lay down. I've also tried just giving in and taking a nap, then when waking up, do my reading.
I've gotten much better at it. >>1700
This is golden advice. 10/10