Arousal fluctuates over time and may influence attentional orienting. This study examined whether baseline pupil-linked arousal predicts spatial orienting in a cueing task, and whether sleep duration and subjective restfulness explain individual differences. Twenty-three participants completed an exogenous cueing task while pupil diameter was recorded. Robust facilitation was observed at short cue–target intervals, but no reliable inhibition of return (IOR) effect emerged at longer intervals. Tonic arousal showed no significant linear association with long-lag orienting, with only weak evidence for a quadratic trend. Sleep duration and restfulness did not predict performance. These findings suggest that, under the present conditions, internal state variables did not reliably account for variability in spatial orienting, and that potential effects may be subtle and difficult to detect.