Where does “slēpaną” come from?

slēpaną (Proto-Germanic) comes from Proto-Indo-European slab- — to be weak, be languid; be weak, limp, languid.

slēpaną (Proto-Germanic): to sleep

Definitions

Step	Language	Word	Meaning
1	Proto-Indo-European	slab-	to be weak, be languid; be weak, limp, languid

slēpaną — Etymology, Origin & Word History | Etymology Explorer