Lying Down Directly After Botox, Is This Not Recommended?

No, I do not think you did anything wrong. Botox should be  injected directly into the muscles involved;  is hard to imagine (even theoretically) that position change after the treatment  will make a difference. I doubt that you will see any difference in the efficacy of the treatment you have received.

Best wishes.

There have been no studies that investigated the positional changes after Botox and studied the number of hours after which it is safe to do normal activity. This has been a theoretically-based recommendation to minimize the chance of the Botox moving to the adjacent area and affecting muscles that shouldn't be treated.  We recommend not to lie down flat (on the back or stomach) or to bend over at the waist for four hours after Botox, but again, this has not been proven to be a problem if those restrictions were not followed by the patient. Possibly the bumps might be more noticable because you increased the blood pressure in the head when lying down but this should go away quickly.