Second, an upright posture increases sympathetic activity and decreases parasympathetic activity, resulting in a heightened level of physiological arousal.Īlthough ample evidence has demonstrated that daytime napping is beneficial for health and cognitive performance, bedding for napping has not yet been scientifically investigated. First, it is difficult to maintain the head in a comfortable position for sleep when sitting upright, and this is likely exacerbated during REM sleep, when muscle tone is very low. There are two main mechanisms that may explain the results. In particular, compared to the flat seat, the reclined seat resulted in similar amounts of total sleep and slow-wave sleep, but 37% less REM sleep and the upright seat resulted in 29% less total sleep, 30% less slow-wave sleep, and 79% less REM sleep. In general, the quantity and quality of sleep obtained in the reclined and flat seats were better than those obtained in the upright seat. latency to REM sleep, arousals, and stage shifts. total sleep time, slow-wave sleep, and rapid eye movement (REM) sleep, and three of four measures of sleep quality, i.e. For the seat-based sleep episodes, there was a significant effect of back angle on three of four measures of sleep quantity, i.e. Polysomnographic data were collected during all sleep episodes. The only difference between conditions was in the back angle of the seat to the vertical during the seat-based sleep periods: 20° (upright), 40° (reclined), and 90° (flat). For each condition, participants had a 4-h sleep opportunity in a bed (02:00–06:00 h) followed by a 4-h sleep opportunity in a seat (13:00–17:00 h). Six healthy adults (3 females aged 27.0 years and 3 males aged 22.7 years) each participated in three conditions. The aim of this study was to examine the impact of “back angle” on the quantity and quality of sleep obtained in a seat during a daytime nap. These rest facilities are typically fitted with a seat with a maximum back angle to the vertical of 20°, 40°, or 90°. road, rail, sea, air) have the opportunity to sleep in on-board rest facilities during duty periods.
Some shiftwokers in the long-haul transportation industries (i.e.
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