diff --git a/ui/easydiffusion/server.py b/ui/easydiffusion/server.py
index a251ede6..ef74be67 100644
--- a/ui/easydiffusion/server.py
+++ b/ui/easydiffusion/server.py
@@ -7,6 +7,9 @@ import mimetypes
 import os
 import traceback
 from typing import List, Union
+import platform
+import subprocess
+import ctypes
 
 from easydiffusion import app, model_manager, task_manager, package_manager
 from easydiffusion.tasks import RenderTask, FilterTask
@@ -28,6 +31,13 @@ from pydantic import BaseModel, Extra
 from starlette.responses import FileResponse, JSONResponse, StreamingResponse
 from pycloudflared import try_cloudflare
 
+import ctypes
+
+# Constants for preventing sleep
+ES_CONTINUOUS = 0x80000000
+ES_SYSTEM_REQUIRED = 0x00000001
+ES_DISPLAY_REQUIRED = 0x00000002
+
 log.info(f"started in {app.SD_DIR}")
 log.info(f"started at {datetime.datetime.now():%x %X}")
 
@@ -40,6 +50,34 @@ NOCACHE_HEADERS = {
 }
 PROTECTED_CONFIG_KEYS = ("block_nsfw",)  # can't change these via the HTTP API
 
+# Constants for preventing sleep on Windows
+ES_CONTINUOUS = 0x80000000
+ES_SYSTEM_REQUIRED = 0x00000001
+ES_DISPLAY_REQUIRED = 0x00000002
+
+class PreventSleep:
+    def __init__(self):
+        self.os_name = platform.system()
+        self.inhibit_process = None
+
+    def prevent_sleep(self):
+        if self.os_name == "Windows":
+            ctypes.windll.kernel32.SetThreadExecutionState(
+                ES_CONTINUOUS | ES_SYSTEM_REQUIRED | ES_DISPLAY_REQUIRED)
+        elif self.os_name == "Darwin":
+            self.inhibit_process = subprocess.Popen(['caffeinate'])
+        elif self.os_name == "Linux":
+            self.inhibit_process = subprocess.Popen(['systemd-inhibit', '--what=handle-lid-switch', '--why="Prevent sleep during image generation"', 'bash', '-c', 'sleep infinity'])
+        else:
+            raise NotImplementedError("Unsupported OS")
+
+    def allow_sleep(self):
+        if self.os_name == "Windows":
+            ctypes.windll.kernel32.SetThreadExecutionState(ES_CONTINUOUS)
+        elif self.inhibit_process:
+            self.inhibit_process.terminate()
+            self.inhibit_process = None
+
 
 class NoCacheStaticFiles(StaticFiles):
     def __init__(self, directory: str):
@@ -267,7 +305,9 @@ def ping_internal(session_id: str = None):
 
 
 def render_internal(req: dict):
+    prevent_sleep_obj = PreventSleep()
     try:
+        prevent_sleep_obj.prevent_sleep()
         req = convert_legacy_render_req_to_new(req)
 
         # separate out the request data into rendering and task-specific data
@@ -299,6 +339,8 @@ def render_internal(req: dict):
     except Exception as e:
         log.error(traceback.format_exc())
         raise HTTPException(status_code=500, detail=str(e))
+    finally:
+        prevent_sleep_obj.allow_sleep()
 
 
 def filter_internal(req: dict):