夜长梦多

wǒ men bì xū mǎ shàng xíng dòng fǒu zé jiù huì yè cháng mèng duō

我们必须马上行动，否则就会夜长梦多。

We must take action at once. Otherwise something untoward may happen.

yè cháng mèng duō wǒ men zuì hǎo bǎ shì qing zǎo diǎn liǎo jié le

夜长梦多。我们最好把事情早点了结了。

A long delay means trouble. We'd better bring the matter to an early conclusion.