Charlotte Watson, 33, took a tumble and cracked the back of her head on a wall in the two-bedroom property which she shared with her partner in Derbyshire.
Her partner Chris Hadley, 34, screamed for a friend, who was staying at their home, to call 999 while he began CPR.
Charlotte was then rushed to Sheffield's Northern General Hospital but medics said the head injury she sustained was "irreversible".
Charlotte was pronounced dead at around 4am on September 8 after medics switched off her life support machine four hours after the incident.
Grief-stricken Chris has told how his life changed forever in "five minutes" after his beloved partner of four years fell.
Chris had passed her on the way to the toilet while she was sat up on the floor in their bedroom at about midnight on September 8 and said she looked dazed.
He described hearing her "tumble" down the stairs and running to find her lying across the floor at the bottom after falling following a five-hour binge-drinking session.
Design engineer Chris, who lives in Killamarsh, Derbyshire said: "The stairs in our house are the very steep stairs you get in old terraced houses – it wouldn't be legal to build houses with them now.
"They don't make them like that any more but we've been up and down them thousands of times. I'm assuming Charlotte tumbled down the steps and hit the back of her head at the bottom.
"I could tell she wasn't breathing so I started CPR straight away – it was all a bit of blur. The CPR seemed to be working OK but there was a lot of blood coming out of her nose.
“She had cracked the back of her skull against the wall and doctors at the hospital told us there was nothing upstairs – no response. It was pretty hard to take.”
Charlotte, who had two degrees, two jobs and a five-year-old son who she adored, drank very little during the week but had no "off switch" once she started, according to Chris.
Chris added: "You just don't realise that within five minutes you can go from being asleep to doing CPR on your partner – you never think they are not going to be there.”
Charlotte's son Teddy is now living with her former partner Adam Jessop.
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