On rare occasions, the Sleep Guardian's vibrations may trigger a night terror. This can occur if your child has already entered the unhealthy sleep cycle that causes night terrors. When your child enters unhealthy sleep, they are likely to have a night terror episode with or without the vibrations, and it's too late for the Sleep Guardian to help.
This event is more closely tied to the timing of the vibrations and not to the strength of the vibrations.
Based on your child's sleep history, the Sleep Guardian's algorithms will often recommend turning on the vibrations a little earlier to preempt the unhealthy sleep patterns.