Excessive brightness not only affects your eyes, but it also influences the hormone production that helps to establish a healthy sleep cycle. Wear a sleep mask if necessary. When it comes to noise , many people find repetitive sounds easier to sleep through than intermittent and abrupt ones. Another option to consider is a white noise machine. Control the thermostat.
Temperature extremes, whether too hot or too cold, are no fun for the light sleeper.
Try to keep your bedtime consistent from night to night. No more napping. Although occasionally refreshing, a power nap cannot substitute for a full night of REM, and it perpetuates the poor sleep cycle. Don't do your taxes, file your nails, direct a play, rescue endangered species, etc. in bed. So, head to bed once you feel sleepy, and if Hypnos, the Greek God of sleep, doesn't pay you a visit within 15-30 minutes, get out of bed.