Green’s Dictionary of Slang

liggen v.

[dial. liggen, to lie down]

to sleep.

1610
16101620163016401650
1651
[UK]Rowlands Martin Mark-all 38: Now the duch word slope is with them vsed, to sleepe, and liggen to lie downe.
[UK]T. Randolph Hey for Honesty III i: I’ll [...] Liggen in strommel.