Just a couple of St. Patrick's experiences with visions from his own writings. Numerous healings and even resurrections were done through him according to other writers.
The following is quoted from Confessio
https://www.confessio.ie/etexts/confessio_english#
16
After I arrived in Ireland, I tended sheep every day, and I prayed frequently during the day. More and more the love of God increased, and my sense of awe before God. Faith grew, and my spirit was moved, so that in one day I would pray up to one hundred times, and at night perhaps the same. I even remained in the woods and on the mountain, and I would rise to pray before dawn in snow and ice and rain. I never felt the worse for it, and I never felt lazy – as I realise now, the spirit was burning in me at that time.
17
It was there one night in my sleep that I heard a voice saying to me: “You have fasted well. Very soon you will return to your native country.” Again after a short while, I heard a someone saying to me: “Look – your ship is ready.” It was not nearby, but a good two hundred miles away. I had never been to the place, nor did I know anyone there. So I ran away then, and left the man with whom I had been for six years. It was in the strength of God that I went – God who turned the direction of my life to good; I feared nothing while I was on the journey to that ship.
...
23
A few years later I was again with my parents in Britain. They welcomed me as a son, and they pleaded with me that, after all the many tribulations I had undergone, I should never leave them again. It was while I was there that I saw, in a vision in the night, a man
[Nota] whose name was Victoricus coming as it were from Ireland with so many letters they could not be counted. He gave me one of these, and I read the beginning of the letter, the voice of the Irish people. While I was reading out the beginning of the letter, I thought I heard at that moment the voice of those who were beside the wood of Voclut, near the western sea
[Nota]. They called out as it were with one voice: “We beg you, holy boy, to come and walk again among us.” This touched my heart deeply, and I could not read any further; I woke up then. Thanks be to God, after many years the Lord granted them what they were calling for.