https://programminglife.net/danger-meditation/
Over-Meditation: When Meditation is an Addiction
Turns out, though, that meditation harbors the same sort of risk. In The Book of Meditation, author Patricia Carrington writes:
If meditation is prolonged for a matter of hours this process of tension-release can be magnified many times. When a person spends this much time meditating, powerful emotions and ‘primary process’ (bizarre) thoughts may be released too rapidly to assimilate and the meditator may be forced into sudden confrontation with long-buried aspects of himself for which he is not prepared. If he has enough inner strength, or is doing the extra meditation under the supervision of an experienced teacher, he may weather such an upsurge of consciousness and emerge triumphant. If he has fewer inner resources or has a past history of emotional disturbance, he may be overwhelmed by it, fragile defenses may break down, and an episode of mental illness result.
How my heart sings 