[tommydoesntknow]

Completely calm for me. HR bpm ~55 to 60. Involuntary homeostatic systems (breath, heart rate, mind, muscles, sensory systems semi-on-offline, stable body temperature, especially temperature) are synced and calmly clocking along.

It does, however, take ~9.5 hours to get the pillow to behave to tolerance.

As for terrifying? Well, there's always real life to look forward to, and terrifying is an appropriate reaction to that impending doom, but I hope this isn't an everyday for you. You could have a sleep disorder, night terrors, PTSD, neurology problem, etc.