Islamic Interpretation of Dreams (Ibn-i Sirin):
To be grateful to God Almighty in a dream means dispelling stress, gaining strength, wealth, blessings, prosperity or a good harvest.
Ifsomeone in authority sees himself thanking God Almighty for His blessings in a dream, it means expansion of his authority. Gratitude to God Almighty for His blessings in a dream represents a monotheist, or one who submits to Gods Will.
If he is a hypocrite, it means that he will turn sincere, and if he is a true being to his Lord, it means that he will join the company of a noble, powerful, wise and a renowned person.
(Also see Prostration)