Morning Wood using UltraSonic Subs overnight?

[JackOfHearts]

Ultrasonic is more powerful if used correctly, people react differently to it even if it has the same script. If your slight erection is not something that happen usually I would say it worked perfectly.
Check your tiredness, Increase the listening time to see if you are more exhausted.
Use the affirmation " I now always remember my dreams" the morning before waking up and before sleeping.