Is it possible to remember my nightmares when i wake up in the morning & remember it the whole day?

Most don't: Most nightmares will provide a vivid pattern that one can remember for a short time. By the time the days distractions come along to cloud your thinking with necessary thought, they fade. If it lingers all day or more there may be emotional issues you need to work out and such a preoccupation is worthy of an evaluation with a therapist.