Rom8:26... For example, when we don't know what to pray for, the Spirit prays for us in ways that cannot be put into words.(CEV).
I read the story of a man that was stirred by the HolySpirit to pray in tongues for lengthy minutes, he did not know why he was praying exactly but He sensed that someone was in danger.
Later, a missionary colleague of his told him about how he was almost killed in Africa by some irate locals on his mission field but an angel appeared to them. He discovered that the incident coincided with the day and hour the Spirit of God stirred him to pray in tongues. Halleluyah!!!
There's a dimension in prayer where all you do is to allow the HolySpirit take over from you because you can't express yourself properly in English or your mother-tongue. Often in prayers, we come with this mentality of 'I know what I want to pray about' but on getting there, we can't flow.
Let the Holy Spirit takeover from you today, He knows what you should pray about.
Find time to pray in the Spirit. Praying 30minutes or more in tongues will benefit your life.