Are you a horror buff who's seen so many scary movies you think nothing can scare you anymore? A novice who's looking to get into the genre? Either way, challenge accepted.
We asked BuzzFeed staff and members of the BuzzFeed Community to share the horror movies that scared them so badly they couldn't sleep. This is a really long list, and there's almost no chance you've seen them all. Keep scrolling to start losing sleep, and don't say we didn't warn you.
Note: Some submissions have been edited for length and/or clarity.
1. Pet Sematary (1989)
2. The Last House on the Left (2009)
3. What Lies Beneath (2000)
4. A Serbian Film (2010)
5. The Visit (2015)
6. The Canal (2014)
7. Mirrors (2008)
8. Boogeyman (2005)
9. Ghost Ship (2002)
10. The Exorcism of Emily Rose (2005)
11. The Babadook (2014)
12. Apostle (2018)
13. The Witch (2015)
14. Deadgirl (2008)
15. Scream (1996)
16. Annabelle (2014)
17. Mother! (2017)
18. Thirteen Ghosts (2001)
19. Hereditary (2018)
20. The Sixth Sense (1999)
21. Jeepers Creepers (2001)
22. As Above, So Below (2014)
23. Jacob's Ladder (1990)
24. The Grudge (2004)
25. The Strangers (2008)
26. Us (2019)
27. Martyrs (2008)
28. Midsommar (2019)
29. Hell House LLC (2015)
30. Paranormal Activity (2009)
31. Puppet Master (1989)
32. The Orphanage (2007)
33. Don’t Be Afraid of the Dark (2010)
34. Baskin (2015)
35. The Human Centipede (2009)
36. Creep (2014)
37. Atrocious (2010)
38. Eden Lake (2008)
39. México Bárbaro (2014)
40. The Woman in Black (2012)
41. The Fourth Kind (2009)
42. The Conjuring (2013)
43. Terrifier (2016)
44. Piranha (2010)
45. Holidays (2016)
46. Burnt Offerings (1976)
47. Funny Games (1997)
48. The Poughkeepsie Tapes (2007)
49. Cabin Fever (2016)
50. The Evil Dead (1981)
51. House of 1000 Corpses (2003)
52. Audition (1999)
53. Cube (1997)
54. Sinister (2012)
55. The Texas Chain Saw Massacre (1974)
56. The Void (2016)
57. The Ring (2002)
58. The Human Centipede 2: Full Sequence (2011)
59. Antichrist (2009)
60. 1408 (2007)
61. Shutter (2004)
62. Suspiria (1977)
63. Hellraiser (1987)
64. Raw (2016)
65. Rec (2007)
66. It (1990)
67. The Hills Have Eyes (1977)
68. Bloody Reunion (2006)
69. Silent Hill: Revelation (2012)
70. Dark Water (2002)
71. Teeth (2007)
72. Strange Circus (2005)
73. The Blair Witch Project (1999)
74. The Possession of Michael King (2014)
75. Jeruzalem (2015)
76. A Quiet Place (2018)
77. Fire in the Sky (1993)
78. Candyman (1992)
79. The Perfection (2018)
80. A Nightmare on Elm Street (1984)
81. Grave Encounters (2011)
82. Event Horizon (1997)
83. Darkness Falls (2003)
84. White Noise (2005)
85. Jacob's Ladder (1990)
86. The Exorcist (1973)
87. Begotten (1990)
88. Creepshow 2 (1987)
89. Phantasm (1979)
90. The Cell (2000)
This article contains content from Allie Hayes, Anna Kopsky, Kelly Martinez, and Angela Andaloro. It was compiled by Kelly Rissman.