To dream that you are climbing a hill, signifies your struggles in achieving a goal.
To see sand in your dream, signifies a shift in perspective or a change in your attitude. Consider the familiar phrase, "the sands of time" in which it may be suggesting that you are wasting your time or letting time pass you by.
To dream that you are groping around in the darkness, symbolizes that you have insufficient information to make a clear decision. Do your research and do not rush into making choices.