Prozac Update

It appears the low 20mg dose of Prozac has helped me drastically with the attacks. The first two months did cause many nights of insomnia but those have stopped. I forgot to take the Prozac this morning after waking at 7am and fell asleep within an hour. I awoke again to eat breakfast but fell asleep soon after that. It is now 5:20 in the afternoon and have finally risen out of bed. I wonder if skipping the dose caused this extreme sleepiness? I will wait a week and try it again and see if my body reacts the same.