Thread.sleep takes lot of CPU time!

Hi,

I have the run method like this:

.....
.....
public void run()
{
....

while(true)
{
....
//some set of operations
.....

Thread.sleep(5*1000*60);

}



In the above code, the sleep operation seems to take a lot of CPU time
though ideally sleep is like a no-op mode, meaning since no operation
is done when a thread sleeps, it should not use any/minimal CPU time.
But it seems to take over 30% of CPU time!

Any ideas on why such a weird thing's happening?

In fact, in one more similar method also, sleep is taking similar CPU
time.

.

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