A police sergeant in the UK is unable to sleep, drive or dress herself after a Palestine Action activist bashed her in the back with a sledgehammer ... and video of the chilling attack has been shown in court.

According to BBC News , the attack happened in August last year when six people used a prison van to break into an Israeli defense firm called Elbit Systems and attack Bristol Police Sergeant Kate Evans .

The outlet reports the accused assailants -- Samuel Corner , Charlotte Head , Leona Kamio , Fatema Rajwani , Zoe Rogers and Jordan Devlin -- deny all charges of aggravated burglary, criminal damage and violent disorder ... but the video paints a different picture.

The police body cam footage appears to show Corner sneak up behind Sgt. Evans and whale on her with

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