Here's why:
* Direct object: A direct object receives the action of the verb. In this case, there is no direct object.
* Indirect object: An indirect object is the recipient of the direct object. Since there's no direct object, there can't be an indirect object.
"Bedtime" is functioning as the subject complement, which is a word or phrase that renames or describes the subject.
Let me know if you'd like to explore other sentence structures or grammatical concepts!