I. \\¦bedē¦bī\ noun
Etymology: baby talk, from bed
: bye-bye III
II. \\"\ adverb
: bye-bye IV

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beddy-byes 7 [ˈbedi baɪz] [ˈbedi baɪz] (BrE) (NAmE ˈbeddy-bye) noun uncountable
a child's word for bed, used when talking about the time sb goes to bed

Time for beddy-byes.

Word Origin:
[beddy-byes] early 20th cent.: from bed + ↑-y and bye-byes.

Useful english dictionary. 2012.