I've been taking Lexapro in the morning ( 6:30 ), but have found out that about 4 hrs. later I'm really tired to the point that I have to lay down for a nap. I would like to start taking it with my evening meal so if that continues to happen I'll be in bed anyway. what is the best way to make that transition since I've already taken my prescribed dose 6:30 am today (5/6)