diff --git a/libc/include/time.h b/libc/include/time.h
index 8e58b84..2fe7cb7 100644
--- a/libc/include/time.h
+++ b/libc/include/time.h
@@ -3,6 +3,8 @@
 
 #include <stddef.h>
 
-void sleep(size_t ms);
+void sleep(size_t s);
+void msleep(size_t ms);
+void usleep(size_t us);
 
 #endif
diff --git a/libc/time/sleep.c b/libc/time/sleep.c
index 7b0f8c9..89ea83a 100644
--- a/libc/time/sleep.c
+++ b/libc/time/sleep.c
@@ -2,7 +2,16 @@
 #include <syscall.h>
 #include <stdint.h>
 
-void sleep(uint32_t ms) {
+// Seconds sleep
+void sleep(size_t s) {
+    syscall(SYS_SLEEP, s*1000, 0, 0);
+}
+
+// Millisecond sleep
+void msleep(size_t ms) {
     syscall(SYS_SLEEP, ms, 0, 0);
 }
 
+// Microsecond sleep
+void usleep(size_t us) { /* TODO */ }
+