Delayed Sleep and Wake on new iMac

Since I got my new iMac about 4 months ago, if I selected "sleep" from the menu, it would sleep immediately. Lately, when I select "sleep" it takes 15-20 seconds before it goes to sleep. Then, this morning, when I tried to wake it up, it took another 15-20 seconds to do so when, in the past, it would wake up immediately also.
Any help as to what's going on?
Thanks.

I don't think there is a shell solution to make a machine sleep, so you have to resort to Applescript.
Worth a try to log in with ssh and run a script like this:
osascript -e 'tell application "System Events" to sleep'
If that doesn't work, try the "eppc" protocol:
tell application "finder" of machine ("eppc://" & otherMachine & ".local") to sleep
I have the above statement wrapped in a pinger to report if the machine is online.
Mac OS X (10.4.7)

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