Mac mini Suspend Mode

My Mac mini is a Late 2012 version.  When it used to sleep, I could press a button on the keyboard several hours later and it would wake up (almost immediately).  Lately, I have to press the power button instead.  It wakes up with a foggy screen and a progress bar and it's nearly two full minutes before I am greated with the password prompt.
I'm not aware of changing any settings or installing any new software / updates, but clearly I've changed something.
What could it be?
Many thanks.
Chris

Try these commands in a terminal window.
to check which sleep mode is active
pmset -g | grep hibernatemode
==============================
to change sleep mode
0= old style sleep  3= new (save to disk style)
sudo pmset -a hibernatemode 0
==============================
to remove sleepimage file which is as large as your installed ram, and save the disk space
rm /var/vm/sleepimage

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