This should have fixed a while back. It works perfectly fine on my 5.1 with many unburnt fuses, unless there's something special about 6.1 that breaks sleep mode?
Could you provide a few more details?
-What CFW are you using
-did you use any particular guides to get things setup
-have you been using cfw for a while, it's been working, and just now have a problem after updating to 6.1 with ChoiDujourNX? Or is this the first time you've been using CFW?
-did you do anything extra like restoring your NAND at any point?
Wait, did you go down to cfw 6.1 from official 6.2? If so, that'd certainly explain it.