DRINK MORE WATER.
Seriously, drinking more water yields great results. Many of us don't break a sweat during the day, so it's easy to feel like we're properly hydrated, but if you have a salty diet, smoke, drink a lot of coffee/soda and don't drink water to compliment it, you are almost certainly dehydrated and don't realize it (even if you're not thirsty).
Gather empirical data if you are skeptical. Try drinking 6-8 glasses of water per day, even if you're not thirsty. You'll feel more awake, you will be less prone to headaches, your eyes won't feel painful and dried out by the end of the day and you'll start to notice many other subtle benefits that add up to a big net positive in terms of how you feel daily.
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DRINK MORE WATER. Seriously, drinking more water yields great results. Many of us don't break a sweat during the day, so it's easy to feel like we're properly hydrated, but if you have a salty diet, smoke, drink a lot of coffee/soda and don't drink water to compliment it, you are almost certainly dehydrated and don't realize it (even if you're not thirsty).
Gather empirical data if you are skeptical. Try drinking 6-8 glasses of water per day, even if you're not thirsty. You'll feel more awake, you will be less prone to headaches, your eyes won't feel painful and dried out by the end of the day and you'll start to notice many other subtle benefits that add up to a big net positive in terms of how you feel daily.