Ge-slǽpan

According to the Old English Dictionary:

-slépan, -slépian [in the Northern glosses of the Gospels the verb is weak]

ge-slǽpan

to sleep :-- He geslépde dormiebat, Mt. Kmbl. Lind. 8, 24. Geslépedon alle and geslépdon dormitaverunt omnes et dormierunt, 25, 5. ge-slæpan