Traditionally:

European (Judeo-Christian)
– In the dream you pray Lord’s Prayer: means well-being; also: you are threatened by secret enemies; you need the support and help of friends so that you can overcome these difficulties.
-You are dreaming that you see other praying: a friend is in danger, do not leave him alone, he needs your help and support.

Hindu (Hinduism)
– In the dream you are praying: at last, your concerns will pass;
– You are dreaming that you see and hear others praying:you are not so credulous; think of your last loss;
– Children reciting: your belief is big and great, God will help you.

* Please, see meaning of prayer.