 The Prophet SAW mentioned the Fajr and the Isha prayer. They are the hardest prayers for the hypocrites, the early prayer and the late prayer. So these two times in particular are times, even the birds, if you listen in the morning, in the late afternoon, and you can hear them doing their tasbih. Allah SWT says about these people that they are not preoccupied from their commerce and their trade from remembering Allah SWT. It doesn't preoccupy them. They remember Allah. One of the Andrissian travelers went to Mecca and when he came back, people used to ask the question, what's the strangest thing you saw? He said, I saw an old man clinging to the Kaaba, asking for dunya. And then I went into the Suq and I saw a young man in the midst of his trading, remembering Allah SWT. The heart, if it's connected to Allah SWT, it remembers Allah SWT.