Good night, Davey. Sleep tight.是什么意思？

Good night, Davey. Sleep tight.

晚安，戴维。睡个好觉。

good

adj. 好的，优秀的，有益的，漂亮的，健全的；n. 好处，利益，善良，善行，好人；adv. 同well；

例句
This recipe makes a good accompaniment to ice-cream.
这道食谱适合搭配冰激凌。

night

n. 夜，晚上，（举行盛事的）夜晚；

例句
Video cameras with night vision can be activated by movement.
带夜视镜的摄像机一有动静就会启动。

Davey

n. 戴维(David 的昵称)(m.)；

例句
Nobody disputed that Davey was clever...
没有人怀疑戴维是聪明的。

sleep

vi.& link-v. 睡，睡觉；vi. 睡，睡觉，睡眠状态；vt. 为…提供床位，提供住宿，以睡觉打发日子；n. 睡眠；

例句
Their sleep is regularly disturbed by the sound of gunfire as criminal gangs settle their nightly accounts.
他们经常被黑帮每晚火拼的枪声所吵醒。

tight

adj. 紧的，牢固的，绷紧的，不漏的，密集的，紧凑的；adv. 紧紧地，牢固地；

例句
His father kept a tight grip on his collar in case he should make a bolt for the door.
他的父亲紧紧抓住他的衣领，防止他夺门而逃。