I would rearrange when I took my meds and/or coffee/caffeine?
I hate that when the midday thing hits and messes with later sleep. My husband naps and I don't know how he does it (still gets to bed/sleep around midnight/1:00 and gets up 8:30ish). I don't get sleepy midday as much since I started thyroid medicine.
I found this?
http://www.askdrsears.com/html/4/T042400.asp