Hello Ghost175.
I’m guessing you are asking for advice 
Personally when I try WILD I find it is very helpful to clear my mind of thoughts, using a form of meditation. After being in this state for a short time I usually find myself falling asleep. This works for me every time unless I’m extremely active. I find my diet can affect how I sleep too, If I eat a lot of sugary food, it is much harder to get to sleep as I find myself feeling fidgety.
The feelings of heaviness do sound like SP or at least the start of it.
There is a thread about WILD that contains a lot of information:
Here
There is also a page on different techniques which is good.
Here