This one can be a little disconcerting. Get an app to track your sleep and find out how much shut eye you really get. You might be surprised by the results (hopefully pleasantly). Sleep is the most important factor for good health, even more so than diet or fitness.
We live in a world that actively promotes sleeplessness, so it can be a battle to get to bed on time. To put it into perspective, Netflix recently revealed that sleep is their number one competitor. Take baby steps. Even an extra thirty minutes will benefit you.