Let Sleeping Corpses Lie
Spanish theatrical release film poster.
Spanish	No profanar el sueño de los muertos
Directed by	Jorge Grau
Written by	Sandro Continenza Marcello Coscia
Produced by	Edmondo Amati
Starring	Cristina Galbó Ray Lovelock Arthur Kennedy
Cinematography	Francisco Sempere
Edited by	Domingo García Vincenzo Tomassi
Music by	Giuliano Sorgini
Production company	Star Films S.A. Flaminia Produzioni Cinematografiche
Distributed by	Fida Cinematografica (Italy) Mercurio Films S.A. (Spain) Miracle Films (United Kingdom)
Release dates	30 September 1974 (1974-09-30) (Sitges) 28 November 1974 (1974-11-28) (Italy) 20 October 1975 (1975-10-20) (Spain)
Running time	93 minutes
Countries	Spain Italy

Let Sleeping Corpses Lie (Spanish: No profanar el sueño de los muertos, lit. 'Do Not Profane the Sleep of the Dead'; also known as The Living Dead at Manchester Morgue^[1] and Don't Open the Window) is a 1974 zombie horror film directed by Jorge Grau, and starring Cristina Galbó, Ray Lovelock and Arthur Kennedy. It focuses on two protagonists who are harassed by a local police investigator in the English countryside and are implicated in murders committed by zombies who have been brought to life by a farming tool designed to kill insects via ultra-sonic radiation.

A co-production between Spain and Italy, Let Sleeping Corpses Lie premiered at the Sitges Film Festival on 30 September 1974, where it won awards for Best Actress (for Galbo) and Best Special Effects. Jorge Grau won the CEC Award for Best Director. In the following years, the film has become a cult classic.^[2]

George Meaning is a man taking a trip to the Lake District. However, a woman named Edna Simmons accidentally damages his motorbike while reversing her car at a petrol station. He demands that she give him a lift to his destination. Edna, planning to visit her sister Katie, proposes to visit the town of Southgate first.

George and Edna eventually come to a dead-end road while searching for Katie's house. George walks to a farm where men from the Ministry of Agriculture use an experimental machine. While asking for directions, he learns that their machinery is designed to kill insects through ultra-sonic radiation. Meanwhile, while waiting at the car, Edna is attacked by a man who emerges from a river. She runs to find George for help, but her attacker is gone when they return to the car.

That night, Katie, who is addicted to heroin, awaits Edna's arrival. Katie's photographer husband Martin goes down to a waterfall near their remote cottage to complete a shoot of plant specimens. Meanwhile, while preparing to take heroin, Katie is attacked by the same man who earlier attacked Edna. Katie is pursued to Martin's photo shoot. There, the man kills Martin, and Katie flees just as George and Edna arrive. When the three report the death, the police inspector suspects foul play from the trio. George, forced to stay in Southgate as a person of interest in the investigation, secretly takes the roll of film from Martin's camera to a chemist to have it developed. Katie has a breakdown and is hospitalised. At the hospital, babies bite and scratch people with homicidal intensity.

At the chemist's, George and Edna collect the photos, but Martin's killer does not appear in any of the pictures; the man is actually a vagrant who drowned in the river. The Inspector arrives and confiscates the photos. He later sends officer Craig to follow the couple. They go to the graveyard and find a half-eaten meal in a room in the chapel. Following noises to a crypt, they come across the vagrant's casket empty, along with a murdered man. Locked into the crypt by someone, they again encounter the zombified vagrant, who brings the other bodies to life. The pair escape along a ladder, kicking out a hole to climb into a freshly dug grave. Craig arrives and helps Edna and George out of the pit. The zombies pursue the trio into the church. They lock themselves in a room but are trapped there, with Craig finding his gun is useless against the zombies. He makes a dash for the police radio he has dropped outside but is caught by the zombies, who devour him.

The dead break into their room, and George throws a lit oil lamp at them. It smashes, and the zombies burst into flame. The two escape to their car, and Edna is sent off to tell the police. George heads to the experimental machine, which is now working within a five-mile radius. The farmer and two government men, however, do not believe George, who eventually smashes the machine.

Meanwhile, the Inspector finds Craig and the caretaker's bodies, and, thinking that Edna and George may be devil worshippers, he issues orders "to shoot to kill." Edna arrives at her brother-in-law's farm and is met by the now-zombified Martin. Edna runs over him as she escapes. George finds Edna, drops her off at a petrol station, and leaves with a large petrol can. George is eventually caught in a police trap, and Martin's body is taken back to the hospital.

In a field, the machine is repaired and switched on again, which brings to life bodies in the hospital morgue. George escapes in a police car and finds that Edna has been taken to the hospital. There, the zombies are now killing people, including Katie and Edna.

George arrives and sets fire to all of the zombies. He is eventually shot by the Inspector, who still does not believe in zombies. Returning to his hotel room for the night, the Inspector finds a zombified George waiting for him. In a field nearby, the machine continues working.

Filming took place on-location in North West England and Lazio, Italy, and at Cinecittà Studios. The scenes featuring the outside of the hospital were shot at Barnes Hospital in Cheadle, Greater Manchester.^[3][4] Some scenes were filmed in the Peak District in Derbyshire, not far from Sheffield, principally in Castleton which stands in for the fictional village of 'Southgate,' and the dramatic Winnats Pass, which has the church superimposed onto it. The church scenes were shot in Hathersage. The opening montage was filmed in Manchester city centre.

The special makeup effects were created by Giannetto De Rossi.

In the English version of the film, Ray Lovelock's voice was dubbed by John Steiner.

The film premiered in Spain on 30 September 1974, in Italy on 28 November 1974, and was released in the United States in 1975 under the title Don't Open the Window, frequenting the drive-in circuits and cinemas paired as a double feature with The Last House on the Left (1972). The film was released in the United Kingdom under its title The Living Dead at the Manchester Morgue, despite the fact that the film takes place in Southgate, not Manchester. It was later reissued under varying titles. In total, the film was released under more than 15 different titles internationally.

While there are claims that a scene in which a zombie eats an eyeball was filmed, no such scene exists in any surviving print of the film, according to the liner notes of the Blue Underground DVD release. During the scene in which Craig is eaten, the female zombie reaches down toward Craig's eyeball, but before anything happens, a seemingly sloppy edit cuts to a long shot of all the zombies feasting. It is part of the DVD Stephen Romano Presents Shock Festival, which was released on 8 January 2010 in the United States.^[5]

According to Edgar Wright, the promotion of the film during its exhibition in the United States was one of the inspirations for the fake trailer Don't, which appears in the 2007 release Grindhouse.^[6]

The film was released for the first time on video and DVD in the U.S. in 2000 by Anchor Bay Entertainment under the Let Sleeping Corpses Lie title. The DVD release was available in a standard edition as well as a limited edition collector's tin containing bonus film stills, a booklet of production notes, and a fake toe tag styled after the film. Both editions featured a foreword and extensive interview with director Jorge Grau.

After the Anchor Bay release of the film went out of print, the disc was re-released by Blue Underground in 2005. In 2008, Blue Underground released the film yet again, only this time in a special edition DVD and Blu-ray under the Living Dead at the Manchester Morgue title. On 27 June 2019, Synapse Films announced a Blu-ray release featuring a new 4K resolution scan of the original 35mm film negatives. It was released on 1 September 2020 in a limited steelbook edition of 6,000 units.^[7]

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From a contemporary review, Verina Glaessner of the Monthly Film Bulletin said the film was extremely close to Night of the Living Dead but praised the direction of Jorge Grau, referring to him as a "director with genuine talent for the macabre mood and unsettling detail"^[8]

Rotten Tomatoes, a review aggregator, reports that 86% of 21 surveyed critics gave the film a positive review; the average rating was 7.35/10.^[9] Writing in The Zombie Movie Encyclopedia, academic Peter Dendle called it "surprisingly effective" and said it has "perhaps the best zombies in a year of very good zombies".^[10] Zombiemania: 80 Movies to Die For author Arnold T. Blumberg said that the movie "manages to sustain interest thanks to a creepy droning soundtrack, some excellent suspenseful sequences and the requisite over-the-top gore," adding that the film "earns a place in zombie movie history by being one of the first to feature an onscreen gut-ripping feasting scene with zombies actually tearing into a living victim."^[11] Glenn Kay, who wrote Zombie Movies: The Ultimate Guide, said that it foreshadowed the later Italian zombie films of the 1980s. Kay called it "the most effective and disturbing Spanish film of the period".^[12]

A sample of dialogue from the film appears in the track "Wizard in Black" by Electric Wizard on their 1997 album Come My Fanatics…. The band has also used the movie poster on merchandise.

A song by the extreme metal group Carcass named "The Living Dead at the Manchester Morgue", named after one of the film's English titles, was released on their 2020 Despicable EP.

The film's American title has been cited as the main inspiration for the name of the Edgar Wright short film, Don't.^[13]

• Kushner, Tony (2006). Remembering Refugees: Then and Now. Manchester University Press. ISBN 0719068835.

• Let Sleeping Corpses Lie at IMDb
• Let Sleeping Corpses Lie at Rotten Tomatoes
• Let Sleeping Corpses Lie at AllMovie