Make sure your room is completely dark. I mean totally. No charger lights, not a blink of light through curtains. Use really thick blankets e.g. to cover the window. You would be surprised how it affects your sleep.
After trying half a dozen or so of the $10-20 Amazon eye masks, I sleep with the Manta Sleep eye mask and am quite happy with it. I see a bunch of other masks in the $30 range that also look like solid options.