“ZMA Sleep Experiment”, 2017-03-13 (; backlinks):
A randomized blinded self-experiment of the effects of ZMA (zinc+magnesium+vitamin B6) on my sleep; results suggest small benefit to sleep quality but are underpowered and damaged by Zeo measurement error/data issues.
I ran a blinded randomized self-experiment of 2.5g nightly ZMA powder effect on Zeo-recorded sleep data during March-October 2017 (n = 127). The linear model and SEM model show no statistically-significant effects or high posterior probability of benefits, although all point-estimates were in the direction of benefits. Data quality issues reduced the available dataset, rendering the experiment particularly underpowered and the results more inconclusive. I decided to not continue use of ZMA after running out; ZMA may help my sleep but I need to improve data quality before attempting any further sleep self-experiments on it.