moonstruck

Short definition from Wiktionary

Adjective

1. 1
   Of a person: perverted or insane, originally supposedly due to the influence of the Moon; compare lunatic.
2. 2
   Showing irrational behaviour, especially of a romantic or sentimental nature; in an entranced or distracted state, especially due to being in love.
3. 3
   Made physically sick, or (like fish) unsuitable for food, by the supposed effect of moonlight.