diff --git a/nixos/modules/system/boot/systemd.nix b/nixos/modules/system/boot/systemd.nix
index 941df5797c66..2a5b3608311a 100644
--- a/nixos/modules/system/boot/systemd.nix
+++ b/nixos/modules/system/boot/systemd.nix
@@ -697,6 +697,16 @@ in
       '';
     };
 
+    systemd.sleep.extraConfig = mkOption {
+      default = "";
+      type = types.lines;
+      example = "HibernateDelaySec=1h";
+      description = ''
+        Extra config options for systemd sleep state logic.
+        See sleep.conf.d(5) man page for available options.
+      '';
+    };
+
     systemd.user.extraConfig = mkOption {
       default = "";
       type = types.lines;
@@ -863,6 +873,7 @@ in
 
       "systemd/sleep.conf".text = ''
         [Sleep]
+        ${config.systemd.sleep.extraConfig}
       '';
 
       # install provided sysctl snippets