besleep

The story

1. Old English · inherited frombeslǣpan“to sleep, sleep through, sleep over”
2. Middle English · inherited frombeslepen
3. English todaybesleep

From Middle English beslepen, from Old English beslǣpan (“to sleep, sleep through, sleep over”), equivalent to be- + sleep. Compare West Frisian besliepe (“to sleep with”), Dutch beslapen (“to sleep with”), German beschlafen (“to lay with”).