a few nights of good sleep now in a row. So if the S4 was causing the problems my body has gotten used to it.
Shoulders and legs today, managed more reps on my lunge and squat sets. I think Ill up the weights on shoulders next week as I am managing to do 10 reps on all 5 sets now.
Taking S4 at the higher amount is affecting how fast my eyes adjust from dark to light, this was more obvious today when I was at work, looking out from my the bright day in the windows to the darker interior.