As Mormons, we try to pray at least morning and night. We do this because we sincerely believe it is critical to following God and understanding His relationship to us. The most simple and accurate comparison is a father with his child. Any good father wants to hear from his child and most children want to talk to their parents. This becomes even more clear when children are away from their parents. I think of times when I have been away those I love with very little communication. There is a sense of longing to see those people again. I think that this is the same way God feels about us and how we feel about Him—although we often do not realize it.
That is why we pray. We learn from the time we are little children that God is there and the way we feel that He is there is through praying. The best thing is that anyone can pray at anytime, no matter who you are or how you feel. It can be verbal or silent, it doesn't matter to God because he wants to hear from us, and we need to hear from Him.