Green’s Dictionary of Slang

slope v.1

[synon. Du.; Rowlands, Martin-Mark-all (1610), notes that this replaces Harman’s and Dekker’s synon. couch a hogshead under couch v., which is ‘like an Almanac that is out of date’]

to sleep.

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[UK]Rowlands Martin Mark-all 38: Now the duch word slope is with then vsed, to sleepe.