Animals use a variety of environmental cues to identify profitable conditions and increase their foraging efficiency. Identifying environmental correlates of foraging behaviour can help to understand the drivers of animal foraging decisions, and the potential consequences should conditions change. We used GPS tracking devices to collect data from 2015-2018 on movement behaviour of 34 individual European nightjars (Caprimulgus europaeus), which forage exclusively at night on aerial invertebrates. To understand how they allocated their time, and whether their behaviour was influenced by the lunar cycle, weather conditions, and habitat, we analysed the environmental factors that influenced foraging within and across multiple nights. Nightjar movement patterns, including changes in behaviour, were primarily driven by the lunar cycle, and cloud cover, with a lesser influence from NDVI and temperature. Nightjars responded to cyclical cues most strongly, foraging more when lunar light levels were high, the moon was low in the sky, and skies were clear. Nightjars also concentrated their foraging in areas containing vegetation that provided efficient movement as well as visibility, supporting the reduced effort hypothesis. Male nightjars foraged significantly more than females, representing their differing breeding roles. On a night by night basis, birds foraged for more time when the moon was between 60% and 90% illuminated, but the strength of this relationship varied dependent on lunar distance, and the amount of cloud present. Birds also foraged more in areas of semi-open vegetation compared to dense areas, as expected, based on their visual searching tactics. We suggest that this indicates a trade-off between prey availability and visibility that may reflect allocating more time to conditions that promote reduced effort and increased foraging efficiency.