Our expert says:
No this is not serious, this is called a Hypnic jerk or a sleep jerk or sleep start or Periodic Limb Movement Disorder. This is regarded as a type of sleep disorder. Treatment is with benzodiasepines or anti-epileptics. It is not dangerous but can lead to chronic tiredness because of disrupted sleep. If you suspect that this is happening every night and more than once it may be useful to get a sleep quality evaluation at a sleep laboratory to see if you need to take preventative medication.
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