We found one dictionary that defines the word undersleeping:

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1. undersleeping: Wiktionary

Opposite: oversleeping, hypersomnia ▸ Words similar to undersleeping ▸ Usage examples for undersleeping ▸ Idioms related to undersleeping ▸ Wikipedia articles (New!) ▸ Words that often appear near undersleeping ▸ Rhymes of undersleeping ▸ Invented words related to undersleeping