delta wave

delta wave {n.}, {informal}, {semi-technical}

A brain wave 1—3 cycles per second, associated with very deep sleep.

Good night, honey, I'm off to produce some delta waves.

Compare: CATCH SOME Z'S, HIT THE HAY or HIT THE SACK.

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Source: A Dictionary of American Idioms

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alpha wave

[alpha wave] {n.} A brain wave, 8-12 cycles per second, associated with a state of relaxation and meditation and, hence, free of anxieties. * /Try to produce some alpha waves; […] A Dictionary of American Idioms

catch some Z's

[catch some Z's] {v. phr.}, {slang}, {informal} To take a nap, to go to sleep. (Because of the "z" sound resembling snoring.) * /I want to hit the sack and […] A Dictionary of American Idioms

sack in/out

[sack in/out] {v.}, {slang} To go to sleep for a prolonged period (as in from night to morning). * /Where are you guys going to sack in/sack out?/ A Dictionary of American Idioms

see off

[see off] {v.} To go to say or wave goodbye to. * /His brother went to the train with him to see him off./ * /When Marsha flew to Paris, […] A Dictionary of American Idioms

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