Wild lettuce gets called lettuce opium for two reasons: a long reputation as a sedative, and a white sap that resembles the milk of the poppy. The plant sat in the pharmacopoeia as a sleep drug for over a century, and it has some scientifically validated pain relieving effects in mice. Going in, the one effect I expected to notice was drowsiness.
The protocol was minimal. I took 500 or 1000 mg before sleep for seven nights back to back. No dream journaling, no behavioral techniques, no stacking. The point was to isolate the chemical and see whether it does anything to dreams on its own.
The 1000 mg dose may have helped me fall asleep earlier, though that reading is uncertain. It is also unclear whether there was any effect at all. My recorded dream vividness, recall, and sleep quality all landed in the average range, and there were no lucid dreams across the week.
There were several dreams that ran more elaborate than my normal range. The signal was weak and easy to explain by ordinary variation. My worst night showed both reduced recall and poor sleep, and an early fast that evening makes it impossible to pin that on the lettuce. It reads as an off night.
So the prediction going in, deeper sleep with more intense dreams, was not supported.
One caveat sits over the whole result. The concentration of active compounds in commercial dried herb can vary a lot, so a null reading here may say more about the material than the plant. There are also more potent preparations, including a resin, that may warrant future study.
As of now I am rating this a low effect compound, with possible benefit for getting to sleep and no measurable effect on the dream state itself.