Where is sleep()?

[Ryan David Sheasby via Digitalmars-d-learn]

Hey guys. First time poster here. I've searched high and low but 
can't seem to find a simple sleep/delay/wait/pause function in 
the core or in phobos. The most recent information I can find 
about it is this forum post from 12 years ago: 
http://forum.dlang.org/thread/avr99b$b8j$2...@digitaldaemon.com In 
which they suggest using std.c.time which is now depreciated and 
seems to have been replaced by core.stdc.time which doesn't have 
any sleep functions... What am I missing?