insomnia
"I am a survivor of brain cancer and now have a memory deficit as a result. My Neurologist suggested I take 100mgs of L-Tryptophan daily to increase the production of serotonin. This he felt would assist with memory function. Long story short, 2 years later, I realize that I have benefited from the side effect of sleepiness. I take my 1000 mg before I go to bed and I sleep like a log."