No distractions, comfortable position (obviously you would need some pillows), and it helps wind down your brain. In the weekend you can also pick up the book again in the morning if you wish. The benefit: you sleep there every day, so you can read a bit every day.
I don't use a smartphone, so no computer in bed means no incoming messages or time-sinks available at the touch of a button; I would recommend leaving the smartphone in another room or having a set routine of placing it in some kind of zero disturbance (or call only) night setting. Whatever works to stop you from grabbing it for some more mindless scrolling in bed. The time you use for reading must come from somewhere, so cut down on the low-value entertainment (this may be hard, I don't know).
Going to bed is something to look forward to when your book is there waiting for you once it is part of your routine. A good book beats starting another episode on Netflix once you've found the genres or writers that work for you.