Many sites that promote phosphatidylserine will say that many studies support that the fatty acid will "greatly" improve your memory. Unfortunately I was unable to find any such articles.
One User of phosphatidylserine comments,
"In general I tend to dream very vividly and at times not very restfully. But additionally, my work in recent years has exposed me to a lot of traumatic material, leaving me with an exaggerated startle response and occasional insomnia. My chiropractor recommended PS to me. I take two of these in the evening now and my sleep is definitely deeper and more sound. My symptoms return if I stop taking it. I think it it has a mild general anxiolytic effect overall. I'm very happy with it, I just wish it were a bit less expensive. But I would recommend it to anyone with similar symptoms to mine."
You can purchase phosphatidylserine as a supplement in many health food stores.