Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Call emergency services if there is serious bleeding, a possible major head or neck injury, severe breathing difficulty, blue or grey lips, or failure to return to normal responsiveness after the event.
Get immediate help if the child has left the home and cannot be found or is in immediate danger.
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
Seek prompt medical advice if the child:
Is injured during an episode
Regularly leaves the house or reaches dangerous areas
Has loud snoring, gasping, or pauses in breathing
Has marked daytime sleepiness or a decline in daily functioning
Develops stiffening, jerking, drooling, or highly repetitive events
Has episodes that suddenly become much more frequent or unusual
3
Does any of this apply?
Book an appointment
Arrange a routine appointment if sleepwalking is frequent, disrupts family life, continues despite adequate sleep, or creates safety concerns.
An appointment is also appropriate if it begins for the first time in an older child or continues regularly through adolescence.
The article also says
Ordinary sleepwalking without injury, breathing trouble, or ongoing abnormal responsiveness is not usually an emergency.
Every sign above is quoted from the sofidex article on Sleepwalking and children. If you are not sure, err upward — it is always reasonable to be checked.