It comes from Travis Payne's testimony (AEG Live Trial, 2013), when he also testified that Michael Jackson was struggling to prepare for the shows.
But he did display obvious signs of insomnia, according to testimonies and leaked emails, such as:
- he exhibited paranoia
- he exhibited anxiety
- he had difficulty with balance
- he was talking to himself
- he was hearing voices (like the voice of God)
- he had difficulty in regulating his body temperature
- he had difficulty in remembering his lyrics
Also, his personal nurse Cherilyn Lee testified that the singer was drinking many Red Bulls (the energy drink) due to his tiredness and fatigue brought on by his insomnia.