I don't know. It could have been a illusion caused by the devil. To be honest, it really doesn't sound like angels. Maybe it was the devil transformed as an angel of light. It could very well have been an illusion. Things like this just don't happen. St Anthony the Great, and many of the other Desert Fathers speak about the Devil doing things very similar to this in order to trick them.
In Elder Paisus' book "Spiritual Struggle", he tells us about how he once heard angelic music while sitting in his cell. This is a very interesting thing he relates to us.
"One night at the Stomion Monastery after the Apodeipnon, (4) I was saying the Jesus Prayer while sitting on a stool in my cell. All of a sudden, I heard loud music playing in a nearby building that was used for guests. I was puzzled by this and though to myself, "Who's playing music so close by?" I knew that the annual festival had ended already. I got up from the stool and went to the window to see what was happening outside. I saw peace and quiet everywhere. Then I realized it was a temptation to interrupt my prayer. I returned to my seat and continued to pray. Suddenly a bright light filled the cell. The ceiling disappeared and the roof opened to reveal a beam of light reaching up to heaven. At the top of this beam of light appeared the face of a blond young man with long hair and a bread, who resembled Christ. Because I could only see half of the face, I got up to see him more clearly. Then I heard within me a voice saying. "You have been made worthy to see Christ." But then I crossed myself and said, "Who am I, the unworthy one, to be made worthy to see Christ?" Immediately the light and the supposed Christ disappeared, and I saw that the ceiling was still in place."
"If a person doesn't have his guard up, the evil one can readily enter his mind thought proud thoughts and delude him with fantasies and false lights, none of which can raise us to Paradise; instead, they will hurl us into chaos."
4:The Church Service which in Orthodox Monasteries follows the evening meal.