Yes. With the SleepSafe app, an Apple Watch can detect the physiological onset of nightmares and night terrors from heart rate and micro-movements, then deliver a gentle haptic to interrupt the episode. All of the detection runs on-device.
What the watch can sense
The Apple Watch continuously measures heart rate and motion. When a nightmare or night terror begins, those signals change in a recognisable way: heart rate climbs, and acceleration and rotation spike. SleepSafe reads that combined pattern to identify an episode as it starts.
From detection to intervention
Detection alone is not the point. Once SleepSafe recognises the signature, the watch delivers a gentle haptic pulse designed to redirect the dream without fully waking you. For night terrors, it can also wake you gently on a schedule, before the episode is due.
On-device by design
The models that power detection are built into the app and run locally on the Apple Watch and iPhone. Nothing needs to be sent anywhere for it to work, so it also functions fully offline.
SleepSafe is a complementary tool, not a replacement for professional medical treatment. If nightmares or night terrors affect your health or daily life, speak with a healthcare provider.
Try SleepSafe
Free on the App Store. Detects nightmares and night terrors on your Apple Watch and gently intervenes, entirely on-device.
