Sleep outcome metrics measured by actigraphy and reported via the daily sleep diary
| Sleep outcome | Data description | Measured | Reported |
| Sleep location | Did participant sleep in own bed? | ● | |
| Time in bed (TIB) | Total time between getting into bed and getting up | ● | ● |
| Sleep onset latency (SOL) | Time elapsed between ‘lights out’ and the onset of sleep | ● | ● |
| Total sleep time (TST) | Total time asleep in bed | ● | ● |
| Sleep period time (SPT) | Time elapsed from first onset of sleep to final awakening | ● | |
| Intervening awake periods | Number of episodes of waking up from sleep | ● | ● |
| Intervening awake duration | The percentage of time in bed spent awake | ● | ● |
| Sleep efficiency (SE) | Percentage of time in bed in recorded sleep, (TST/TIB)×100 (%) | ● | ● |
| Sleep fragmentation index* | Time mobile and immobile, the index provides a measure of restlessness during sleep | ● | |
| Average light intensity | Intensity of bedroom light during the night (lux) | ● | |
| Central phase measure | Midpoint between ‘fell asleep’ and ‘wake up’, expressed as the number of minutes past midnight | ● | |
| Sleep quality rating | 1–5 Likert scale: 1=very poor; 5=very good | ● | |
| Rested/refreshed on awakening | 1–5 Likert scale: 1=not at all rested; 5=very rested | ● | |
| Thermal comfort in bedroom | 1–5 Likert scale rating: 1=extremely comfortable; 5=not at all comfortable | ● | |
| Sleep disturbance attributed to temperature | 1–5 Likert scale rating: 1=extremely disturbed; 5=not at all disturbed | ● | |
| Nap duration | Total time spent napping in the previous day | ● |
*The sleep fragmentation index is calculated as (percentage of the TST categorised as ‘mobile’ in epoch-by-epoch analyses)+(the number of immobile bouts ≤1 min expressed as a percentage of the total number of immobile bouts in the TST).