Stopped: Funding for project ended
There are three components to this study: a Field Trial, a Shift Worker Survey, and Focus Groups. The Investigators will study the effectiveness, feasibility, and acceptability of an 8-h sleep intervention in older night workers in an operational environment. The overall goal of the Field Trial is to minimize sleep deficiency and negative outcomes resulting from that, including sleepiness and performance impairments during night shift work. The Shift Worker Survey is designed to understand some of the demographic and operational factors that enable or inhibit the ability of individual shift workers to adopt this intervention. The Focus Groups are designed to glean in-depth information from older shift workers who indicate that they are unable or unwilling to adopt an 8-h sleep timing intervention. Understanding these factors will assist in refining and targeting the intervention to those individuals who will be most likely to benefit from the intervention sleep timing strategy.
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Total Sleep Time (TST)
Timeframe: The TST averaged for up to 3 intervention nights (in minutes) will be compared between groups.
Sleep Fragmentation Index (FI)
Timeframe: The FI averaged for intervention nights 2 and 3 will be compared between groups.
Wake After Sleep Onset (WASO)
Timeframe: The WASO averaged for intervention nights 2 and 3 will be compared between groups.
Subjective Sleep Quality
Timeframe: Subjective Sleep quality (refreshment) averaged for intervention nights 2 and 3 will be compared between groups.
Subjective Alertness Via Karolinska Sleepiness Scale (KSS)
Timeframe: The KSS score taken at the end of the final night shift (night shift 3) during the intervention block will be compared to that at baseline.
Sustained Attention
Timeframe: PVT mean of slowest 10% of responses measured at the start of the final night shift (night shift 3) during the intervention block will be compared between groups.
Subjective Energy
Timeframe: Subjective Energy measurements taken at the end of the final night shift (night shift 3) in the intervention block will be compared between groups.
Subjective Stress Via Visual Analog Scale (VAS)
Timeframe: Subjective Stress via VAS measurements taken at the end of the final night shift (night shift 3) in the intervention block will be compared between groups.
Subjective Calmness Via Visual Analog Scale (VAS)
Timeframe: Subjective Calmness via VAS measurements taken at the end of the final night shift (night shift 3) in the intervention block will be compared between groups.
Subjective Health Via Visual Analog Scale (VAS)
Timeframe: Subjective Health via VAS measurements taken at the end of the final night shift (night shift 3) in the intervention block will be compared between groups.
Subjective Alertness Via Visual Analog Scale (VAS) - DATA NOT COLLECTED
Timeframe: Subjective Alertness via VAS measurements taken at the end of the final night shift (night shift 3) in the intervention block will be compared between groups.