Others maintain its usual definition, suggesting it limits the preceding description to mean that they remained conscious despite their weariness. Ultimately, these interpretations dilute the meaning of βαρέω (to burden, Luke 21:34; Matthew 26:43, etc.), implying that they were inclined towards sleep. From a different perspective, it could be conveyed that the Apostles were in a state of physical lethargy while still perceiving their surroundings. The grandeur of the miracle, as depicted by the Evangelists, makes it hard to believe they could have fallen asleep.
The first interpretation seems more accurate. The journey of Christ with His disciples to the mountain likely occurred in the late afternoon, supported by Luke's account of Christ descending the next day. Exhausted from their day’s tasks, the apostles succumbed to sleep, paralleling their experience in the garden of Gethsemane, while Jesus began to pray. When the transfiguration of Christ took place, the radiance of His face and garments roused them; they first beheld the transformation of the Lord and then the appearance of Moses and Elijah. Regarding Peter, Luke notes that he started to speak about the Lord and then about the two men. He speaks as they observe Moses and Elijah departing from Jesus (verse 33), indicating that he was unaware of what he was saying. Mark emphasizes that they did not know how to respond because they were frightened.
Luke's description and the content of Peter’s declarations illustrate that the apostles' emotional state cannot easily be classified as fear at that moment; while they were later gripped with fear upon hearing the voice of God the Father, their initial reaction was one of intense yet joyful excitement. Observing Moses and Elijah’s intention to leave, Peter exclaimed, “Lord, it is good for us to be here!” Desiring to prolong the joy that overwhelmed him, Peter childishly suggested, “If you wish, I will make three booths here, one for you, one for Moses, and one for Elijah.” Reflecting on this extraordinary emotional state, Peter describes their experience as a form of fear, which was truly felt by the apostles when they encountered the voice of God the Father.