This change parallels the language used in the unix man page.
.. function:: sleep(secs)
- Suspend execution for the given number of seconds. The argument may be a
+ Suspend execution of the calling thread for the given number of seconds.
+ The argument may be a
floating point number to indicate a more precise sleep time. The actual
suspension time may be less than that requested because any caught signal will
terminate the :func:`sleep` following execution of that signal's catching