Spotting a shadow in the darkness, Nicola Hardie reached for a kitchen knife, Selkirk Sheriff Court, pictured, was told on Monday.
The 32-year-old claimed she didn’t realise it was a police officer, saying she had earlier dialled their number by mistake.
Hardie, who had been drinking that evening, admitted behaving in a threatening or abusive manner at her Larchbank Street home in Galashiels on August 6.
Prosecutor Tessa Bradley said Hardie, who now lives at Riddle Dumble Park in Galashiels, had “a history of alcoholism”.
She said police received a call around 11.30pm.
“There was very loud music playing in the background and she said that there were voices in her ears,” explained Ms Bradley.
Officers attended about midnight and found the room in darkness, so switched on a light.
“The accused had gone into the kitchen where loud music was playing and was asked to turn it down.
“She ignored the police constable and he switched off the music himself,” said the prosecutor, adding: “The accused grabbed a knife from a block in the kitchen and brandished it.”
After repeatedly ignoring their requests to put the knife down, officers warned Hardie they would use their CS spray, causing her to drop the knife.
Heather Stewart, defending, said her client had been drinking prior to the offence and rang the police in error, believing she had called an NHS phoneline.
“It was dark and she saw a shadow, so picked up the knife. She didn’t know it was the police and didn’t know why they were there,” added the lawyer.
Sheriff Kevin Drummond deferred sentence until September 30 for a psychiatric report.