diff --git a/kernel/CMakeLists.txt b/kernel/CMakeLists.txt
index fe25dd0a..d8427116 100644
--- a/kernel/CMakeLists.txt
+++ b/kernel/CMakeLists.txt
@@ -22,6 +22,7 @@ set(SOURCES
     src/sys/console_write.cpp
     src/sys/clock_gettime.cpp
     src/sys/allocate_memory.cpp
+    src/sys/usleep.cpp
     src/InitRD.cpp
     src/ELF.cpp
 )
diff --git a/kernel/src/sys/usleep.cpp b/kernel/src/sys/usleep.cpp
new file mode 100644
index 00000000..970b887b
--- /dev/null
+++ b/kernel/src/sys/usleep.cpp
@@ -0,0 +1,12 @@
+#include "sys/Syscall.h"
+#include "thread/Scheduler.h"
+#include <sys/types.h>
+
+Result<u64> sys_usleep(Registers*, SyscallArgs args)
+{
+    useconds_t us = (useconds_t)args[0];
+
+    kernel_sleep(us / 1000);
+
+    return 0;
+}
diff --git a/libc/CMakeLists.txt b/libc/CMakeLists.txt
index 9f686d94..567f5a08 100644
--- a/libc/CMakeLists.txt
+++ b/libc/CMakeLists.txt
@@ -1,4 +1,4 @@
-file(GLOB HEADERS include/*.h)
+file(GLOB_RECURSE HEADERS include/*.h)
 
 set(SOURCES
     ${HEADERS}
diff --git a/libc/include/sys/types.h b/libc/include/sys/types.h
index cf368ed9..c4adbd49 100644
--- a/libc/include/sys/types.h
+++ b/libc/include/sys/types.h
@@ -11,5 +11,6 @@
 typedef int pid_t;
 typedef __i64_t time_t;
 typedef __u16_t mode_t;
+typedef __u64_t useconds_t;
 
 #endif
diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index 218be84d..de7d321b 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -24,6 +24,12 @@ extern "C"
     /* Calls the operating system kernel for a specific service. */
     long syscall(long num, ...);
 
+    /* Sleeps for X microseconds. */
+    int usleep(useconds_t us);
+
+    /* Sleeps for X seconds. */
+    unsigned long sleep(unsigned long seconds);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/libc/src/unistd.cpp b/libc/src/unistd.cpp
index 58b0c277..d83afe5b 100644
--- a/libc/src/unistd.cpp
+++ b/libc/src/unistd.cpp
@@ -1,5 +1,7 @@
+#include <bits/errno-return.h>
 #include <stdarg.h>
 #include <stdint.h>
+#include <sys/syscall.h>
 #include <unistd.h>
 
 extern "C" long arch_invoke_syscall(long, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
@@ -23,4 +25,16 @@ extern "C"
 
         return rc;
     }
+
+    int usleep(useconds_t us)
+    {
+        long rc = syscall(SYS_usleep, us);
+        __errno_return(rc, int);
+    }
+
+    unsigned long sleep(unsigned long seconds)
+    {
+        syscall(SYS_usleep, seconds * 1000000);
+        return 0;
+    }
 }
diff --git a/luna/include/luna/Syscall.h b/luna/include/luna/Syscall.h
index 96277f77..65b1adf4 100644
--- a/luna/include/luna/Syscall.h
+++ b/luna/include/luna/Syscall.h
@@ -1,6 +1,7 @@
 #pragma once
 
-#define enumerate_syscalls(_e) _e(exit) _e(console_write) _e(clock_gettime) _e(allocate_memory) _e(deallocate_memory)
+#define enumerate_syscalls(_e)                                                                                         \
+    _e(exit) _e(console_write) _e(clock_gettime) _e(allocate_memory) _e(deallocate_memory) _e(usleep)
 
 enum Syscalls
 {