deep sleep
"deep-sleep" is a 9-letter English headword indexed on PlainSpell.
The verdict
“deep sleep” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 10
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Used other than figuratively or idiomatically: see deep, sleep.
| Property | Value |
|---|---|
| Headword | deep sleep |
| Language | English |
| Part of speech | Noun |
| Letters | 10 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “deep sleep” sits in English frequency
Rare enough to double-check
deep sleep is uncommon English outside the top frequency list, classed as anoun. Rarity is why readers land here mid-draft. 3 senses are on record.
deep sleep has no tracked misspelling variants, a straightforward case of a spelling with little room for common typos. No close-neighbour confusable shows up for this headword in our dataset, suggesting its spelling stands apart enough that readers rarely confuse it with something else.
This entry carries no recorded etymology, so any spelling logic here comes from how the word's sounds map to letters, not a documented origin story. The correct English form is deep sleep, spelled D-E-E-P- -S-L-E-E-P.
Definition
- 1Used other than figuratively or idiomatically: see deep, sleep.
- 2stage 3 of non-rapid eye movement sleep
- 3Artificially induced hibernation in humans for the purpose of long distance space travel.
This word in other languages
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “deep sleep”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is D-E-E-P- -S-L-E-E-P - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.