diff --git a/V2/sleep/Cargo.lock b/V2/sleep/Cargo.lock
index 8acea86..d352971 100644
--- a/V2/sleep/Cargo.lock
+++ b/V2/sleep/Cargo.lock
@@ -3,7 +3,7 @@ name = "sleep"
 version = "0.1.0"
 dependencies = [
  "argparse 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "shuteye 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -31,11 +31,6 @@ name = "redox_syscall"
 version = "0.1.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "shuteye"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "time"
 version = "0.1.36"
@@ -62,7 +57,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
 "checksum libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)" = "88ee81885f9f04bff991e306fea7c1c60a5f0f9e409e99f6b40e3311a3363135"
 "checksum redox_syscall 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)" = "29dbdfd4b9df8ab31dec47c6087b7b13cbf4a776f335e4de8efba8288dda075b"
-"checksum shuteye 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2fae018891baadd06ff0281ff137ccd1641044d9bb9498b1138ffecf28f30172"
 "checksum time 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)" = "211b63c112206356ef1ff9b19355f43740fc3f85960c598a93d3a3d3ba7beade"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
diff --git a/V2/sleep/Cargo.toml b/V2/sleep/Cargo.toml
index 04986f4..48785e9 100644
--- a/V2/sleep/Cargo.toml
+++ b/V2/sleep/Cargo.toml
@@ -5,5 +5,5 @@ authors = ["Simon Wörner <git@simon-woerner.de>"]
 
 [dependencies]
 argparse = ">=0.2.1"
-shuteye = ">=0.2.0"
+libc = ">=0.2"
 time = ">=0.1.36"
diff --git a/V2/sleep/src/main.rs b/V2/sleep/src/main.rs
index 040f04b..de3fc28 100644
--- a/V2/sleep/src/main.rs
+++ b/V2/sleep/src/main.rs
@@ -1,6 +1,6 @@
 #![feature(step_by)]
 extern crate argparse;
-extern crate shuteye;
+extern crate libc;
 extern crate time;
 
 use std::io::prelude::*;
@@ -9,9 +9,36 @@ use std::path::Path;
 use std::time::Duration;
 
 use argparse::{ArgumentParser, Print, Store};
-use shuteye::sleep;
+use libc::{c_long, clock_nanosleep, time_t, timespec};
 use time::precise_time_ns;
 
+const CLOCK_MONOTONIC: i32 = 1;
+
+pub fn sleep(duration: Duration) -> Option<Duration> {
+    let ts = duration_to_timespec(duration);
+    let mut remain = timespec {
+        tv_sec: 0,
+        tv_nsec: 0,
+    };
+    let ret = unsafe { clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, &mut remain) };
+    println!("ret = {}", ret);
+    if remain.tv_nsec == 0 && remain.tv_sec == 0 {
+        return None;
+    }
+    Some(timespec_to_duration(remain))
+}
+
+fn duration_to_timespec(duration: Duration) -> timespec {
+    timespec {
+        tv_sec: duration.as_secs() as time_t,
+        tv_nsec: duration.subsec_nanos() as c_long,
+    }
+}
+
+fn timespec_to_duration(timespec: timespec) -> Duration {
+    Duration::new(timespec.tv_sec as u64, timespec.tv_nsec as u32)
+}
+
 fn duration_from_ns(duration_ns: u64) -> Duration {
     Duration::new(duration_ns / 1_000_000_000, (duration_ns % 1_000_000_000) as u32)
 }