I am trying the ZMT caps to help me get a good nights sleep. I took a second dose of the ZMT caps about an hour after the first dose because I was wide awake thinking about a very stressful situation. About 20 minutes later I started feeling very sleepy and would start falling asleep but kept waking myself up because I was having dreams that started out great but were just really bizarre. Once I finally fell asleep and stayed asleep, I can't rememeber having anymore dreams and actually had the absolute best sleep ever. Is there a possibilty that by taking four ZMT caps I was taking too much Tryptophan, is there an upper limit for Tryptophan that should not be reached?