/usr/sbin/unity-system-compositor.sleep is in unity-system-compositor 0.4.3+16.04.20160323-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/sh
sleep .1
exec /usr/sbin/unity-system-compositor --disable-inactivity-policy=true --on-fatal-error-abort $@
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