midnight
Grim told him to come back to visit him if he needed protection . `` Yet , '' he said , `` I would gladly avoid the penalty of being outlawed for harbouring you . '' Grettir bade him farewell and said : `` It is more likely that I shall need your good services still more later on . '' Then Grettir rode North over the Tvidaegra Heath to Bjarg , where he arrived at midnight . All were asleep except his mother . He went to the back of the house and entered by a door which was there , for he knew all the ways about . He entered the hall and went to his mother 's bed , groping his way .