NightWatch Portal information

NightWatch Online Data Portal 3.0

Heart Rate graph

The blue graph depicts the measured heart rate in beats per minute. If you hover over this graph with your cursor, you will see the heart rate value at that point in time. It is also possible to zoom in on the graph. Click and drag in the plot area to zoom in. Some notifications might be visible in this graph. Seizure alarms are depicted as red alarm bells in the graph and other notifications reported by NightWatch are shown as blue info icons.

NightWatch could raise an alarm based on the following reasons:

  • Rhythmic movements = Rhythmic movements have been detected which might relate to epileptic activity

  • Vibrating movements = Vibrating/muscle tension movements have been detected which might relate to epileptic activity

  • Shaking movements = Wild shaking movements have been detected which might relate to epileptic activity

  • Heart rate increase = The heart rate rose suspiciously

  • High heart rate = The current heart rate is suspiciously high compared to a moment before

  • Low heart rate = The current heart rate is suspiciously low

The technical notifications can consist of the following:

  • Unable to detect heart rate = There has not been a reliable heart rate signal for a while.

  • Bracelet connection lost = Bracelet is out of reach or is switched off

  • Bracelet battery Low = The battery of the bracelet is running low

Motion graph

The green graph shows the intensity of motions detected by the sensor. The intensity of the motion graph is measured by shivering movements and the speed of these movements. If the shivering movement is subtle, the graph will reach a lower value than when the sensor is shaken wildly. The degree of intensity is indicated on a 1-20 scale.

Sensitivity graph

When the wearer of NightWatch is putting on the bracelet, the NightWatch will stay in low sensitivity mode until the wearer will go to sleep. When the wearer of NightWatch is sleeping and the armband is detecting a horizontal position of the body, the NightWatch algorithms function at full capacity. The graph in the portal will show ‘High Sensitivity’ at these moments and the base station of NightWatch will show a continuous green LED, showing that the algorithms are fully active.


When the wearer temporarily gets up or leaves the bed, most of the algorithms will temporarily be disabled, until the armband detects that the wearer is lying down and sleeping again. This is designed in order to reduce the false alarm rates, induced by normal human activity while being awake. This low sensitivity state is shown in the graph as ‘Low Sensitivity’ and the base station will show a green flashing LED while being in this state. When NightWatch is in 'High Sensitivity' the base station will show a continuous green LED.

If you see too many Low sensitivity periods while someone is sleeping, repositioning the armband (based on the wearers sleeping characteristics) often helps to improve the sensitivity of the recordings. If you need any help with this, please contact us.

Sharing a graph

You can easily share a graph. To do so, click on the link shown below the chart. You can send this link, for example, via e-mail. The receiving person does not have to log in before the chart is shown. This link also works on a mobile device.