NightWatch Portal information

Heart Rate graph
The blue graph depicts the measured heart rate in beats per minute. You will see the heart rate value if you hover over this graph with your cursor. 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 lightning bolts in the graph, and other notifications reported by NightWatch are shown as orange bells.

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 = A reliable heart rate signal has not occurred for a while.

  • Bracelet connection lost = The arm module (sensor) is out of reach or switched off

  • Bracelet battery Low = The battery of the arm module (sensor) is running low

Motion graph
The green graph shows the intensity of motions detected by the sensor. Shivering movements and the speed of these movements measure the intensity of the motion graph. 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 scale of 1 to 20.

Sensitivity graph
When the wearer of NightWatch puts on the sensor, NightWatch will stay in low sensitivity mode until the wearer goes to sleep. When the wearer of NightWatch sleeps and the sensor detects a horizontal body position, 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 gets up or leaves the bed, most algorithms will temporarily be disabled until the sensor detects that the wearer is lying down and sleeping again. This is designed to reduce the false alarm rates induced by regular human activity while 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 sensor (based on the wearer’s sleeping characteristics) often helps to improve the sensitivity of the recordings. If you need any help with this, please get in touch with 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 need to log in before the chart is shown. This link also works on a mobile device.