Can Unix sleep in terms of mili/micro?

[2307GILLV%MUCSD.BITNET at cunyvm.cuny.edu]

The nap () system all in Xenix 2.3.2 can sleep in terms of
milli seconds.   Caveat Emptor This function is linked with
the system clock, which is, in most has a granularity of
tens of milli seconds.

        -I compute, Therefore I VAX
        -Dicky Gill at MUCSD.EDU