Tracking dreams and nightmares

Does sleep tea work?

As a semi-lucid dreamer, dreaming has always been a bit part of my life. A rather sudden and weird change happened to me in terms of dream activity, so I’ve been recording my occurrences of nightmares for the last two months.

Earlier this year I went overseas for a break off study. In a strange new continent. Alone. Trying to find myself, discover how I really feel and what I truly believe. Meeting strange people, eating strange food, observing and experiencing strange ways of life. English speakers not always being available. I had only 3 nightmares during those 70+ days.

I came home to having nightmares every other night. At first, the most twisted nightmares I’ve ever had; ones that are not safe to share or remember. I was confident and ready to confront my problems instead of trying to hide from them. Were these nightmares just out of stress, adjustment, or was my subconscious trying to tell me something? Perhaps it was just the nine hours of jet lag and my body complaining about it. Actually, I do know of one major influence: that house triggered my tinnitus. (In fact, I could almost reasonably blame my having tinnitus on living in that house.)

My friend recommended I try sleep tea to reduce nightmares. I bought sleep tea with chamomile and peppermint. Sleep tea is not only meant to make you sleep better, it’s meant to calm you and relieve stress in a manner that one might imagine conducive to suppressing possible nightmares. Whether it was effective or I was simply benefiting from the placebo effect (which is not a bad thing either), I felt like it made a big difference. I tended to wake up too early due to jet lag but sleep tea was able to keep me knocked out sometimes. I set out to prove or disprove the effectiveness of sleep tea on suppressing my nightmares: using statistics.

Two months data

  • I had at least 19 nights with nightmares and up to 41 nights without nightmares. I only tested sleep tea on 8 of these nights for various reasons such as not wanting to wake up late and not finding nightmares to be a tangible disturbance to my mental health except with regard to sleep quality.
  • My average recall of nightmares probably lies somewhere between 40% and 99%. The number of recorded nights with nightmares is therefore an underestimate and the nightmare-less nights is an overestimate.
  • It is easier for me to remember whether I had a nightmare than how many distinct nightmares I had on the previous night. In any case, I had more than 40 nightmares over these 60 days.
  • I encountered new forms of nightmares so it sometimes became difficult to distinguish what was a nightmare and what was just an unpleasant dream.
  • A nightmare is also known as a “bad dream,” but I generally don’t consider dreams that are both good and bad or just mediocre to be a nightmare unless the bad part is disturbing enough that it wakes me up.
  • I did not track dreams, but I certainly had dreams (including nightmares) on the majority of nights.


The experiment failed; I’m pulling the plug. Temporal factors were too significant. The assumptions of probability might have been reasonable for an earlier period of the experiment, but are no longer reasonable. I “lost” (overcame?) my reliable “source” of nightmares. I also don’t have enough data for nights where I drink sleep tea, but even if I did, the results would be skewed in favor of the hypothesis that drinking sleep tea makes a huge difference, when in reality it is most likely the result of other interfering factors too.


It would have been an interesting experiment, and I’ll admit it: I just wanted to do it cause I find applying statistics fun sometimes. I wanted to compute a 90% confidence interval for the minimum percentage of dreams supposedly being suppressed as a consequence of drinking sleep tea. But my results are now incredibly biased. The frequency of my nightmares has decreased significantly, and I don’t need statistics to confirm this. For one thing, I moved out of the house, started flatting for the first time in my life, and have been constantly challenging myself to face my problems. Unfortunately for my craving of practical applications of statistics…