Three studies examined the hypothesis that feeling tired along with feeling happy might be linked to the acceptance of atypical ideas. Consistent with this hypothesis, across 3 studies and using 2 different measures of accepting atypical ideas, feelings of happiness and tiredness interacted. When people were high in tiredness, as happiness increased, so too did acceptance of atypical ideas (choosing more unusual exemplars and suggesting more unusual solutions to the gestalt completion test). When people were low in tiredness, happiness had no effect on acceptance of atypical ideas. The studies also examined whether differences in sensation-seeking (Studies 1 & 2) and acquiescence (Study 3) mediated the effect, but neither consistently did so. This work suggests that the combination of feeling tired and happy may enhance acceptance of atypical or unusual ideas, which could potentially help creative thought.