For me the problem still persists with 10.10.3 (the whole error appeared after switching to clover btw).
Is there a way to test the suggestion from wastez23? I'm also not quite sure what files to change...
To test it, go to /System/Library/Extensions/IOPlatformPluginFamily.kext/Contents/PlugIns/X86PlatformPlugin.kext/Contents/Resources/ and select the plist that matches your model name (for example, if you are using iMac14,2 it will be Mac-27ADBB7B4CEE8E61.plist)
I experienced this deep sleep problem months ago but never checked if someone had such problems till today. I will try the suggested fix by wastez23 tonight and see if the computer doesn't crash.
In my case, my computer blinks a light when in sleep mode. After a long time, the light stays lit and the only way I can go back into Yosemite is clearing up the CMOS and re-configuring the UEFI options again.
Apr 18 00:40:48 kernel[0]: kern_open_file_for_direct_io(0) took 4 ms
Apr 18 00:40:48 kernel[0]: Opened file /var/vm/sleepimage, size 2147483648, partition base 0x0, maxio 2000000 ssd 1
Apr 18 00:40:48 kernel[0]: hibernate image major 1, minor 0, blocksize 4096, pollers 5