Hi Maire,
I too take mine in the morning; I take mirtazapine at night and when I was prescribed both that was how I was told to take them. Without the mirtazapine I struggle to get to sleep too; Tamoxifen doefishermen to cause insomnia, even though I don't get hot flushes or night sweats! I've heard the side effects are worst around 5hrs after taking the pill, but that may be anecdotal rather than scientific fact.
Lisa xx