Both views to the outside and exposure to light can help us recover from stress and improve health, mood, vitality, and cognitive performance (Berman et al, 2008; Boyce et al, 2003; Partonen & Lonnqvist, 2000; Ryan et al, 2009; Walch et al, 2004). People often prefer being in a natural over the more artificial built environment (Hartig & Staats, 2006), and prefer daylight over artificial light (Veitch & Gifford, 1996). Preference has been linked to restorative potential (Van den Berg et al., 2003). Beneficial effects of nature are attributed to psychological processes (Kaplan, 1995; Ulrich, 1983) whereas effects of light exposure have mostly been attributed to biological processes, although psychological mechanisms have also been proposed (Boyce et al, 2003). The striking overlap in effects attributed to daylight exposure and viewing nature - both natural phenomena - inspired us to investigate and compare the restorative effects of both phenomena within various paradigms. In the current series of studies, we have investigated the ego-replenishment potential of these two phenomena. Ego-depletion theory (Baumeister et al, 1998) holds that self-control relies on a limited resource. When exerting self-control on a task, performance on a subsequent task also requiring self-control will be reduced either through resource depletion or resource conservation (Muraven et al, 2006). Recently, a theoretical link between ego-depletion and restoration theory has been made (Kaplan & Berman, 2010). In the present studies, we tested whether nature and light indeed can help overcome ego-depletion. More specifically, we tested whether the degree of naturalness of these two phenomena influence the restorative potential. For this purpose, we performed a series of studies (all N = 80 – 90). We used a typical ego-depletion design, in which a first task requiring self-control was followed by a second task also requiring self-control (dependent variable). In between the first and the second task participants were exposed to our experimental stimuli (pictures or light), enabling us to test ego-replenishment. In study 1 we manipulated view type (natural vs urban). In study 2 we manipulated the perceived naturalness of light (natural vs artificial) by providing participants with differential descriptions of the same light-source. A third study is foreseen, testing real daylight versus artificial light. In all studies light intensity was kept constant, thereby excluding biological effects. During the experiments, psycho-physiological measures were taken and perceived stress, trait and state self-control, and need for restoration were probed where possible. Results of Study 1 indicate a clear replenishing effect of nature on self-control. Data collection and analysis of study 2 are still ongoing. The joint results of these studies will provide insights in the underlying restorative processes, the role of naturalness, and the restorative potential of daylight and nature.