das Schlafengehen
going to bed
The process or action of getting into bed in order to sleep. It refers to the time or activity at the end of the day.
Für Kinder ist eine feste Zeit zum Schlafengehen wichtig.
A fixed bedtime is important for children.

bedtime
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going to bed
The process or action of getting into bed in order to sleep. It refers to the time or activity at the end of the day.
Für Kinder ist eine feste Zeit zum Schlafengehen wichtig.
A fixed bedtime is important for children.

This word is a nominalization of the verb 'schlafen gehen' (to go to sleep / to go to bed). It describes the action as a noun. Such nominalizations of verbs always have the article 'das'.
Das frühe Schlafengehen fällt mir im Sommer schwer.
Going to bed early is hard for me in summer.
'Schlafengehen' (going to bed) is very often used with prepositions that mark a point in time. Typical phrases are 'vor dem Schlafengehen' (before going to bed), 'beim Schlafengehen' (while going to bed), or 'nach dem Schlafengehen' (after going to bed).
Vor dem Schlafengehen lese ich gerne noch ein paar Seiten.
Before going to bed, I like to read a few more pages.
A very common combination is 'Zeit zum Schlafengehen' (time for bed / time to go to bed). It is used to express that it is the right moment to go to bed.
Es ist schon spät, für die Kinder ist es jetzt Zeit zum Schlafengehen.
It's already late; for the children, it's time to go to bed now.