夢 dream

Last evening I had this dream: a MOOING flower was caught inside a net. Perfectly clear, eh?

crazy about something/one ★★★☆☆
夢 (dream) + 中 (middle) = 夢中 (crazy about something/one)

to be totally crazy about or obsessed with or rapturous about something/someone. (literally: lost in a dream)

nightmare ★★☆☆☆
悪 (bad) + 夢 (dream) = 悪夢 (nightmare)