大卫赢得了歌唱一等奖；他依然很兴奋,现在还未打算睡觉.David has won the first prize in singing; he is still very excited now and feels (little) desire to go to bed.feels little desire 的意思是“没打算/...答案是：the least大卫赢得了歌唱一等奖；他依然很兴奋，现在还未有半点睡意。
He is still very excited now and feels the least desire to go to bed.

little 和 the least 都说得通。

一般情况下，获奖后会很激动而无法入睡，所以是 feels the least desire to go to bed。