heres a free tip no need to buy anythin, sleep as usual and when you wake up on the next morning,drink lots of water and try to make an eye exercises (looking at the green spot etc. tree) or even move your eyeball upwards and downwards.It is difficult to do that,but you can be successful if you try harder.Do the exercise daily .Secondly, drink coffee or Nescafe .It makes you eye never feeling the tiredness eventhough you make lots of exercises.