For me, alone with God, is not so much a prayerful time. That is the time I am having a very deep conversation with Him. Questions, doubts, fears, anxiety and whatever else. I am just talking to Him. I stop many times in between the conversation and wait for an answer. I am quiet in His awesomeness. And He does speak. The Jews say, that when God speaks to an individual, that person hears the voice of God as the voice of his teacher(Enoch hears the call from God, him thinking he heard the voice of his grandfather, his teacher) or many times, God speaks to the individual in his own voice.
For those who walk with God because they believe in The Christ, the inner voice of the heart is the Holy Spirit.
It is awesome, after the conversation, the calm, the quietness and the wait for His acknowledgement. And then, the heart reveals. Such feelings makes the Believer proclaim, Hallelujah, Praise be to God, Father Praise be to Your Name, Blessed Be Your Name, Hallelujah.