Just found this over at xda. Will give this a go and see how it goes then report back.:

"Try the instructions below, fixed my deep sleep problem(thanks to Mister Jozo)

0.go to settings > sound and turn off touch sounds and screen lock sounds

These steps stop the kernel wakelock 100% problem:

1.turn on aeroplane mode
2.turn off device
3.take out battery for 10 seconds
4.turn on device
5.wait for everything to load
6.turn off aeroplane mode
"