**''SLEEP''**

The ''SLEEP'' special function pauses current LabLisp process, while other processes can perform their tasks, just like ''WAIT''. It expects one argument that must evaluate to number - it will be number of seconds to wait. Accepts integer or float number and internally rounds to milliseconds. For non-positive numbers will not sleep - it treats negative time as zero sleep time.

<code lisp>
(sleep 2)           ; sleeps at least 2 seconds
</code>


The timing will not be accurate, but the ''SLEEP'' will pause for at least the given time, it sets internal timer and checks it repeatedly. The sleeping is driven by the same mechanism as ''WAIT'' so the internal timer of ''SLEEP'' is checked only when the sleeping process is given control. 

See ''WAIT'' for more information.