Sleeping under the risk of predation

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What can inactivity (in its various forms) reveal about affective states in non-human animals? A review (2015, background): “This is in part because inactivity has rarely 53 been the focus of behavioural studies and is often considered simply a default state rather 54 than a true „behaviour‟ (see e.g. Lima et al., 2005; Levitis et al., 2009).”
Spatial memory and animal movement. (2013, background): “The costs of sleep include lost foraging opportunities , decreased use of energy-conserving mechanisms such as torpor , and increased risks of predation because vigilance necessarily decreases during sleep (Lima et al. 2005; Roth et al. 2010).”
Clues to the functions of mammalian sleep (2005, background): “Large herbivores may have evolved reduced sleep amounts because they are more vulnerable to predators than small herbivore”
Network physiology reveals relations between network topology and physiological function (2012, background): “Further, as risk of predation modifies sleep architectur”