Feeling very tired and sleepy, week 4?

I’m beginning to complete my first month of starting Prozac, currently at my 30 day mark. I’m beginning with 10mg.

I used to feel very energetic throughout the day, I would sleep quite a lot. Now, I’m waking up fairly early, my eyes are dry and sleepy. Feeling very fatigued. Confused as to why these symptoms are starting at the end of the month instead of the beginning.