Drowsiness from Kisqali?

I am in the middle of my second cycle of Kisqali with fulvestrant for de novo mets. My first cycle ended on day 12 due to low WBC and recurrence of shingles. I am on a reduced dose of 2 tablets.

I take Kisqali at 7am and find that everyone morning except one I have been very drowsy and unable to stay awake. I sleep for a couple of hours and then fatigue and brain fog for the rest of the day. It is making functioning a challenge. Which is already hard due to lupus, fibromyalgia and FND.

I am wanting to find out if this will possibly improve over time or not.

Thanks