“Nocturna itinera, sum in magna animi perturbatione...”
(The unconscious travel during the night and dreams, my soul is deeply disturbed...)
The main inspirational sources originated from the world of dreams and sleep but also from the mythological stories related to deities called Sirens.
Someone is falling asleep, hypnotized by an enchanted singing. This atmosphere will leed to the fantastic world of dreams which can be nightmares - nightmares typically feature fear or horror, and/or the sensations of pain, falling, drowning or death. He/She wakes up suddenly in a state of distress and is prevented to fall back into sleep for some time. He/She wants to be saved. A night terror (pavor nocturnus) gains possession of him/her and is characterized by extreme terror and a temporary inability to regain full consciousness.