If your willing (and I cant believe im suggesting this) You can load TX's payload. (the demo, dont actually pay for the darn license) Running that payload allows you to use sleep mode while using homebrew in 3.x without fail. Aside from that, unfortunatley CTCaers hekate mod still doesnt currently support due to the bug not being resolved yet. But from what I understand he opened up a new ticket regarding that on his Github page stating that it is being worked on....more or less.