I'm cycling off Epicenter (good product!) and I noticed my sleep has retuned to sub-par. When I was taking it, I would take it 5:00pm'ish and by 9 or so I would be sleepy and would sleep like a log. Now, without it, I'm up to 11 and sleep so-so? I know magnesium helps and I still take that but something is missing? Any ideas?