The early bird gets the worm

If you wake up early in the morning, it will be good for your health, and you will be able to work and study faster, so you will benefit.
“Three sentences” means three coins, which means “very few”.
Even if it is only three sentences, it is used with the meaning of admonishing the morning sleep because there is something to be gained.
Get up early, find some good little things and start the morning!