Why not take a hard look at the bottles in your medicine cabinet, including over the counter preparations that you may not consider as medicine. If you find yourself slowing down at an unusual time of the day (mid-morning) or within an hour of taking a medication, you may have found the suspect.
If you suffer from allergies like me, you should know that even those non-sedating formulas of anti-histamines cause drowsiness in some individuals. In fact, many kinds of pills can. Some people have been swearing by melatonin as a good antidote for jet lag, so I went ahead and tried this when we went to Europe in 2003. Guess what? I was totally knocked out the next day, I felt far worse than if I hadn’t taken anything.
It is highly likely that the combination of medications you’re on can be the cause of your sluggishness.You can ask your doctor or pharmacist if all the drugs : OTC, herbal and prescription should be taken on a staggered basis over the course of the day. Or maybe the dosage can be split- take half in the morning and half at night.