When is the best time of day to take Tamoxifen

My oncologist suggested that if I was nauseous I could try taking it in the evening but I never had any nausea - only hot flushes and it didn't make any difference when I took it.
I'm now on Arimidex and again it makes no difference what time of day I take it so I take it in the morning with my breakfast because then if I forget I have all day to try and remember...