Das kann schon seinen Sinn haben. Das Sleep ist ja unter Windows intern auf die gleichnamige Windows-Routine verdrahtet und dazu sagt
MSDN:
Zitat:
A value of zero causes the thread to relinquish the remainder of its time slice to any other thread that is ready to run. If there are no other threads ready to run, the function returns immediately, and the thread continues execution. Windows XP: A value of zero causes the thread to relinquish the remainder of its time slice to any other thread of equal priority that is ready to run. If there are no other threads of equal priority ready to run, the function returns immediately, and the thread continues execution. This behavior changed starting with Windows Server 2003.