Q: trouble waking from sleep

I haven't solved it.  Instead I've just set the computer to never fall asleep and if I'm going to be away from the computer for a few hours I turn it off instead of putting it to sleep.  (With the fusion drive it can start up from off just as fast as it can wake from a deep sleep anyway.)

I'm hoping an OS update fixes the problem.

Yes, I'm pretty sure it's deep sleep or "safe sleep" that is causing our problems.  It's a feature that acts more like a bug, in my opinion.  I hope they fix it.

http://support.apple.com/kb/HT1757

"With the release of the OS X Mountain Lion v10.8.2 supplemental update 2.0, a new feature was introduced to enter safe sleep after four hours of the computer being connected to AC power. This is an effort to comply with the European Energy Standards (ErP Lot6). This will only occur if there is no wireless or Ethernet activity and no activity from external devices such as USB storage devices."

Although, If it was introduced in 10.8.2 I don't know why it's causing these problems in 10.11.2  You'd think it would be all ironed out by now.

The update to osX 10.11.3 seems to have fixed the problem.

If it doesn't fix it for you, and you're brave enough to enter commands in the Terminal, you could try setting autopoweroffdelay to 86400 (so it won't enter safe sleep until 24 hours have gone by) and/or setting autopoweroff to 0 (so it doesn't enter safe sleep at all) as I understand it.

suda pmset -a autopoweroffdelay 86400

suda pmset -a autopoweroff 0

enter pmset -g in the Terminal to see what your current settings are.  On a desktop hibernatemode should be set to 0 also.

Yup, what you're describing is the same problem I've been having.  If it's asleep for a short time, there's no problem, but if it's asleep for a long time it goes into something called "safe sleep" which is apparently harder for the computer to wake from.

You could just turn off the computer at night.  The new ones with fusion drives can turn on just as fast as they can wake from safe sleep anyway.  Or try the simple Terminal commands I described above.

I'm sorry it didn't work for you.  Here's what I did exactly step by step

First I entered these into the Terminal

suda pmset -a autopoweroffdelay 86400

suda pmset -a autopoweroff 0

Then, before I had a chance to test to see if it worked, an OS update was released, so I updated to 10.11.3

Then I reset my Energy Saver settings to their default by clicking restore defaults on that section of System Preferences.

I haven't had the problem of the computer having trouble waking up since then.