Online prenatal trial in mindfulness sleep management (OPTIMISM)

This is a two-arm, parallel-group randomized controlled trial. A total of 45 pregnant women between 12 and 28 weeks gestation were recruited from the community and randomly assigned to a mindfulness or education-only control group in a 1:1 ratio. During the study, all participants completed six weekly online modules, daily sleep diaries, and optional participation in a treatment-specific online discussion forum. Feasibility outcome measures included study recruitment, retention, intervention adherence (number of online modules completed, number of meditation days per week), and intervention acceptability (8-item questionnaire). The primary clinical outcome measure was sleep quality measured with the Pittsburgh Sleep Quality Index. Secondary outcome measures included sleep measured with actigraphy and diaries (sleep efficiency, total sleep time, total wake time), Patient-Reported Outcomes Measurement Information System (PROMIS) measures (fatigue, sleep-related impairment, sleep disturban..., Study survey data were collected and managed using Research Electronic Data Capture (REDCap). Objective sleep data were collected using a combination of daily sleep diaries and nighttime actigraphy with an Actiwatch Spectrum Plus (Philips Respironics, Murrysville, PA). Participants were asked to wear the actigraph and keep sleep diaries for 8 days at baseline and post-intervention. Actigraphy-measured sleep variables included total sleep time (TST), defined as the number of minutes of all time spent asleep; sleep efficiency (SE), a measure of sleep quality calculated as the ratio of TST divided by total time in bed ×100, with values closer to 100 meaning more efficient (better) sleep; sleep onset latency (SOL), defined as the number of minutes from getting into bed to falling asleep; total wake time (TWT), defined as the total number of minutes spent awake during the rest period; and wake after sleep onset (WASO), defined as the number of minutes awake between time falling asleep and wa..., , # Data from: Online prenatal trial in mindfulness sleep management (OPTIMISM)

[https://doi.org/10.5061/dryad.vt4b8gv39](https://doi.org/10.5061/dryad.vt4b8gv39)

## Description of the data and file structure

This study tested an online mindfulness-based intervention for pregnant women with insomnia.  Self-report surveys and objective sleep monitoring were collected pre-intervention and post-intervention in two groups:  mindfulness intervention and education-only control. 

### Files and variables

#### File: OPTIMISM\_actigraphy\_summary\_03052025.xlsx

**Description:** This file contains participants' sleep-actigraphy data pre-intervention and post-intervention. Mean values are reported over up to 8 days (nights) of measurement.

##### Variables

* ID:  unique participant identifier
* Intervention: allocation to intervention or control group
* no_of_days_of diary_or_actigraphy1: pre-intervention number of days sleep data recorded using diaries and actigraphy
* avg_Time_in_bed1: pre-i...,