The project will contribute with new knowledge concerning how short rest periods between two consecutive shifts (\<11h, often defined as a Quick Return (QR)) affects sleep and cognitive performance. The study will further examine whether individual differences in personality traits and genotypes may explain individual differences in performance and sleep. Data will be collected with a randomized cross-over design, in an experimental laboratory setting.
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Sustained Attention
Timeframe: Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
Sleepiness
Timeframe: Changes from first to last test session on day 2, in a simulated QR (evening- followed by day shift) and changes from first to last test session on day 2, in the control condition (day- followed by day shift). Day 2 both combinations: 7AM-3PM.
Objective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Sleep Onset Latency'
Timeframe: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
Objective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Total Sleep Time'
Timeframe: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
Objective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Time in Light Sleep'
Timeframe: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
Objective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Time in Deep Sleep'
Timeframe: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).
Objective Sleep, one sleep opportunity between day- followed by day shift versus one sleep opportunity between evening- followed by day shift - 'Time in Rapid Eye Movement(REM)-sleep'
Timeframe: Sleep taking place between the two days in the QR condition (from 11PM-7AM) compared to sleep taking place between the two days in the control condition (from 3PM-7AM).