diff --git a/newlib/libc/posix/sleep.c b/newlib/libc/posix/sleep.c
new file mode 100644
index 000000000..f7c780ef0
--- /dev/null
+++ b/newlib/libc/posix/sleep.c
@@ -0,0 +1,22 @@
+/* libc/posix/sleep.c - sleep function */
+
+/* Written 2000 by Werner Almesberger */
+
+#ifdef HAVE_NANOSLEEP
+
+#include <errno.h>
+#include <time.h>
+#include <unistd.h>
+
+unsigned sleep(unsigned seconds)
+{
+    struct timespec ts;
+
+    ts.tv_sec = seconds;
+    ts.tv_nsec = 0;
+    if (!nanosleep(&ts,&ts)) return 0;
+    if (errno == EINTR) return ts.tv_sec;
+    return -1;
+}
+
+#endif
diff --git a/newlib/libc/posix/usleep.c b/newlib/libc/posix/usleep.c
new file mode 100644
index 000000000..9322b6551
--- /dev/null
+++ b/newlib/libc/posix/usleep.c
@@ -0,0 +1,22 @@
+/* libc/posix/usleep.c - usleep function */
+
+/* Written 2002 by Jeff Johnston */
+
+#ifdef HAVE_NANOSLEEP
+
+#include <errno.h>
+#include <time.h>
+#include <unistd.h>
+
+int usleep(useconds_t useconds)
+{
+    struct timespec ts;
+
+    ts.tv_sec = (long int)useconds / 1000000;
+    ts.tv_nsec = ((long int)useconds % 1000000) * 1000;
+    if (!nanosleep(&ts,&ts)) return 0;
+    if (errno == EINTR) return ts.tv_sec;
+    return -1;
+}
+
+#endif