Where does “sleepfulness” come from?

sleepfulness (English) comes from English sleepful, from English sleep, from Middle English slepen, from Old English slǣpan, from Proto-West Germanic slāpan, from Proto-Germanic slēpaną, from Proto-Indo-European slab- — to be weak, be languid; be weak, limp, languid.

sleepfulness (English): The quality of being sleepful

Definitions

  1. The quality of being sleepful

Ancestry of “sleepfulness”, step by step

sleepfulness traces back through two separate lines of ancestry.

via English sleepful

StepLanguageWordMeaning
1EnglishsleepfulStrongly inclined to sleep; very sleepy
2EnglishsleepTo rest in a state of reduced consciousness; To...
3Middle Englishslepento sleep; to become asleep, to cause to sleep; to...
4Old Englishslǣpan
5Proto-West Germanicslāpanto sleep
6Proto-Germanicslēpanąto sleep
7Proto-Indo-Europeanslab-to be weak, be languid; be weak, limp, languid

via English Ness

StepLanguageWordMeaning
1EnglishNessAn Ulster princess and the mother of Conchobar mac Nessa and Findchoem in the Ulster Cycle of Irish mythology. Daughter of Eochaid Sálbuide. Also the mother of Cormac Cond Longas by incest with Conchobar mac Nessa
2Middle Englishnesse
3Old Englishnæsnot, not at all; not; first/third-person singular...
4Proto-Germanicnasjąfoothill; headland; cape
5Proto-Indo-Europeannéh₂snose
Every word from Proto-Indo-European slab-Every word from Proto-Germanic slēpanąEvery word from Proto-West Germanic slāpan