Beatrix Potter
The Tale of the Flopsy Bunnies
eBook
(Prabhat Prakashan May 24, 2019)
It is said that the effect of eating too much lettuce is "soporific."
I have never felt sleepy after eating lettuces; but then I am not a rabbit.
They certainly had a very soporific effect upon the Flopsy Bunnies!