MyIQtested research data: How many hours did you sleep last night? (sleep) Data set version 2026-09-29.2. Responses 2026-09-22 to 2026-09-29. Generated 2026-09-30. Page: https://www.myiqtested.com/research/sleep-and-iq Licence: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Credit MyIQtested and link to the page above. WHAT THIS IS Aggregates of a one-question survey shown to MyIQtested test takers after the test and before their score. No individual responses, visitor ids or timestamps are included. 31169 people answered on MyIQtested (33691 were shown the question; the rest skipped it). The sample is self-selected online test takers. It describes patterns in this sample, not why they occur. FILES sleep-aggregates.csv every answer x age band x country cell (one header row) sleep-summary.csv adults 18+ and all ages, adjusted: reproduces every number quoted on the page sleep-personality-summary.csv the personality figure: gap and 95% interval per answer x Big Five trait sleep-datapackage.json Frictionless data package describing the CSVs COLUMNS OF sleep-aggregates.csv site string myiq (MyIQtested test takers) answer_id string machine id of the answer answer_label string the answer as shown to the person age_band string under_13, 13_15, 16_17, 18_24, 25_34, 35_44, 45_54, 55_64, 65_plus, or unknown (prefer not to say, skipped, missing) country_code string ISO 3166 alpha-2 code, or OTHER (countries with fewer than 150 MyIQtested answers, and rows with no country) country_name string English name of the country n integer people in the cell suppressed integer 1 when n is under 5: the statistics are left blank iq_gap_vs_age_country number mean test score of the cell minus the mean of everyone who answered this question in the same age band and country, in points (score steps are 3 points = 1 question). Relative only: the scoring is a fixed conversion, not an empirical norm, so no absolute level is published iq_sd number sample standard deviation of the scores in the cell Cells with fewer than 5 people are suppressed (statistics left blank, suppressed = 1; n is still shown). Countries with fewer than 150 MyIQtested answers are pooled into OTHER. iq_gap_vs_age_country and iq_sd are computed over the n people in the cell (sd = sample standard deviation). The score scale is a fixed mapping (score = 51 + 3 x correct answers, range 55-155), not an empirical norm, and online takers score high on it. Differences between groups are meaningful; absolute levels are not. COLUMNS OF sleep-summary.csv dataset_version string version of the data set these rows come from question_id string id of the survey question view string adults_adjusted = adults 18+, all countries, adjusted for age band and country; all_ages_adjusted = everyone, adjusted answer_id string machine id of the answer answer_label string the answer as shown to the person n integer people who gave this answer in the view share_of_view number n divided by everyone who answered in the view (0 to 1) gap_points number difference in test-score points between this answer group and all respondents in the view (0 = same as everyone). Blank when n_too_small = 1 ci95_low number lower end of the 95% confidence interval of gap_points ci95_high number upper end of the 95% confidence interval of gap_points mean_percentile number average percentile (0-100) of the group, measured against everyone of the same age band and country median_percentile number median percentile, same measure n_too_small integer 1 when the group has fewer than 30 people in the view: no gap or percentile is given HOW THE GAPS ARE COMPUTED Adjusted views use direct standardisation: each answer group is compared with everyone, within each age band x country stratum, and the stratum differences are averaged with weights proportional to the stratum sizes of everyone in the view (strata where the group has nobody are dropped and the weights renormalised). The 95% interval comes from the stratified standard error. Percentiles are measured within each person's own age band and country. Every range is a 95% confidence interval, and every difference we point out holds at 95% confidence after correcting for the number of comparisons (Holm method). Rows are counted exactly as the Lab "Test Survey" report counts them; repeat takers are not removed. COLUMNS OF sleep-personality-summary.csv dataset_version string version of the data set these rows come from question_id string id of the survey question view string adjusted = adjusted for age group and country; raw = not adjusted. Both cover all ages answer_id string machine id of the answer answer_label string the answer as shown to the person trait string Big Five trait: Openness, Conscientiousness, Extraversion, Agreeableness or Emotional sensitivity n integer people who gave this answer after the SeeMyPersonality Big Five test gap_percentile_points number difference in trait percentile points between this answer group and all respondents (0 = same as everyone). Blank when n_too_small = 1 ci95_low number lower end of the 95% confidence interval of gap_percentile_points ci95_high number upper end of the 95% confidence interval of gap_percentile_points n_too_small integer 1 when the group has fewer than 30 people: no gap is given The same question was also shown after the SeeMyPersonality Big Five test. This file holds only the numbers the page's personality figure shows: for each answer and trait, the gap in percentile points versus all respondents and its 95% interval, adjusted for age group and country and not adjusted, all ages. Percentiles are measured against that test's own norms. No per-cell or per-group averages are published.