diff --git a/semestralka_2_uart/src/hw_uart_pc/init.rs b/semestralka_2_uart/src/hw_uart_pc/init.rs
index fdd77f6..986451b 100644
--- a/semestralka_2_uart/src/hw_uart_pc/init.rs
+++ b/semestralka_2_uart/src/hw_uart_pc/init.rs
@@ -30,6 +30,7 @@ pub enum LowPowerCmd {
     Standby,       // 3
     Shutdown,      // 4
     StopMode(StopModeConfig),
+    Sleep,
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, defmt::Format)]
@@ -62,6 +63,7 @@ pub async fn uart_cmd_task() {
             [3] Standby minimal\r\n\
             [4] Shutdown\r\n\
             [5] Stop mode (0-3)\r\n\
+            [6] Sleep mode (WFI or WFE)\r\n\
             "
         ).await;
         embassy_time::Timer::after(embassy_time::Duration::from_millis(8)).await;
@@ -112,7 +114,8 @@ pub async fn uart_cmd_task() {
                     _ => { print_menu().await; continue; }
                 };
                 CMD_CH.send(LowPowerCmd::StopMode(StopModeConfig { mode: stop_mode, entry })).await;
-            }
+            },
+            b'6' => CMD_CH.send(LowPowerCmd::Sleep).await,
             _ => { print_menu().await; continue; }
         }
     }
diff --git a/semestralka_2_uart/src/sleep/handler.rs b/semestralka_2_uart/src/sleep/handler.rs
index 9ca4d2a..bc30236 100644
--- a/semestralka_2_uart/src/sleep/handler.rs
+++ b/semestralka_2_uart/src/sleep/handler.rs
@@ -57,5 +57,11 @@ pub async fn execute_low_power(
                 }
             }
         }
+        LowPowerCmd::Sleep => {
+            info!("Entering Sleep mode (WFI)...");
+            use crate::sleep::sleep::{enter_sleep_mode, SleepEntry};
+            enter_sleep_mode(SleepEntry::Wfi);
+            info!("Woke up from Sleep mode.");
+        }
     }
 }
diff --git a/semestralka_2_uart/src/sleep/mod.rs b/semestralka_2_uart/src/sleep/mod.rs
index a2d253e..0ae2f7f 100644
--- a/semestralka_2_uart/src/sleep/mod.rs
+++ b/semestralka_2_uart/src/sleep/mod.rs
@@ -4,5 +4,6 @@ pub mod standby;
 pub mod shutdown;
 pub mod stop;
 pub mod handler;
+pub mod sleep;
 
 pub use stop::StopEntry;
diff --git a/semestralka_2_uart/src/sleep/sleep.rs b/semestralka_2_uart/src/sleep/sleep.rs
new file mode 100644
index 0000000..8d132c3
--- /dev/null
+++ b/semestralka_2_uart/src/sleep/sleep.rs
@@ -0,0 +1,19 @@
+// src/sleep/sleep.rs
+
+use cortex_m::Peripherals;
+
+#[derive(Clone, Copy, Debug, defmt::Format)]
+pub enum SleepEntry {
+    Wfi,
+    Wfe,
+}
+
+pub fn enter_sleep_mode(entry: SleepEntry) {
+    let mut core = unsafe { Peripherals::steal() };
+    core.SCB.clear_sleepdeep();
+
+    match entry {
+        SleepEntry::Wfi => cortex_m::asm::wfi(),
+        SleepEntry::Wfe => cortex_m::asm::wfe(),
+    }
+}