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Get ready for bed (7 letter answer)
The answer UNDRESS is so rare that it appears less than once every 2500 puzzles.
UNDRESS as a noun:
1. partial or complete nakedness; "a state of undress"
UNDRESS as a verb:
1. (undress, discase, uncase, unclothe, strip, strip down, disrobe, peel) = get undressed; "please don't undress in front of everybody!"; "She strips in front of strangers every night for a living"
2. (strip, undress, divest, disinvest) = remove (someone's or one's own) clothes; "The nurse quickly undressed the accident victim"; "She divested herself of her outdoor clothes"; "He disinvested himself of his garments"