Your letter did, indeed, find me well, thank you! To answer your inquiry, I wouldn't recommend adding an additional ingredient to a Sleeping Draught as it's already powerful enough as it is, though I think you would do well with a chamomile brew an hour or two beforehand as it'll help further relax your mind.

I hope this information will suffice; please don't hesitate to owl if I can be more help!

Love from,