The Flowers of Morning Glories Die after only a few hours, that's why they are called Morning Glories.
There are also flowers in the same family called Four O Clocks, that bloom around 4:00 pm, and there are also Moon Flowers that are in the Morning Glory Family.
My Heavenly Blue Morning Glories are about to Flower!! Here is the first sign of a Morning Glory when it is about to flower
Here is my whole Morning Glory Plant at 46 Days of Age.