She is not saying Sleeplessness but Sleepiness. Are you referring to feeling fatigue or very tired. That is how I felt and still feel some days. They told me it could last a month or two after radiation treatment ends.
It's gonna take a while to get energy back from the treatments you have done. Your body has been thru a lot. The tomoxifen may be adding to it, but give it time & you will get past this. Prayers to you.
When they gave me my first one they were surprised I was awake. Benadryl is part of the cocktail and you are supposed to sleep. But chat with onc if it seems ongoing.
Usually I was awake week
And then got sleepy.
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