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It sounds simple, but it was a big milestone for 23andMe Research because it was our first “interventional study” — the first time that research participants changed something about their lifestyle and measured the impact. Participants who had reported trouble sleeping in the past made some lifestyle changes — like avoiding caffeine after noon, or exercising daily — and they recorded the impact of those changes on their sleep quality.
This was the first time we had asked 23andMe research participants to make lifestyle changes, and we had no idea how closely they would follow the study plan. In the end, we were blown away by how many people made the Sleep Study a priority in their daily lives — over 6,600 people enrolled in all! This blog post is dedicated to those participants — without them, none of this would be possible.
Study participants spent two weeks recording their normal behavior in regular sleep diaries, followed by four weeks of lifestyle changes. We asked them about their sleep quality (measured using the Pittsburgh Sleep Quality Index, a.k.a. PSQI) before the study and after it finished.
And… it worked! Participants reported better sleep quality at the end of the study than they did at the beginning across the board. No matter which lifestyle change(s) people chose to make, their sleep quality improved. 
That is great news — but of course, like most scientific studies, this one raised as many questions as it answered. While it looks like all of the lifestyle changes successfully improved sleep quality, we still can’t say for sure why sleep quality improved in every group.
In fact, maybe we should be surprised that all of the interventions worked so similarly. Remember, study participants recorded their behavior in sleep diaries, so we can tell which lifestyle behaviors people changed the most during the month-long study:
From this chart, you can see that participants made the biggest change to their screen time before bed, while they made much smaller changes to their napping habits. This is probably because of differences in participants’ baseline lifestyle — since only about 10 percent of participants took naps on a normal day before the Sleep Study started, there wasn’t much room for improvement. On the other hand, over 80 percent of participants looked at screens within a half hour of bedtime at baseline, and so people who chose to limit screen time during the Sleep Study ended up making a more dramatic lifestyle change, on average.
But if limiting screen time was a more dramatic lifestyle change for most participants, and avoiding naps was relatively minor, how did both changes lead to similar improvements in overall sleep quality? Well, maybe small changes to napping habits can be as effective as big changes to screen exposure. Or maybe the lifestyle changes themselves weren’t the whole story — maybe just paying close attention to your sleep hygiene is enough to improve your overall sleep quality over time.