also good night
1.
You say ‘Goodnight’ to someone late in the evening before one of you goes home or goes to sleep.
CONVENTION formulae
2.
If you say ~ to someone or kiss them ~, you say something such as ‘Goodnight’ to them or kiss them before one of you goes home or goes to sleep.
Eleanor went upstairs to say ~ to the children...
Both men rose to their feet and kissed her ~.
...a ~ kiss.
PHRASE