* **fell sound asleep** - "fell into a very deep sleep" or "slept deeply." It means that he was very much asleep.
* **deep and terrifying darkness** - "extreme darkness that that terrified him"
* **overwhelmed him** - "surrounded him"
* **strangers** - "aliens" or "foreigners"
* **and will be enslaved and oppressed** - This can also be translated with an active clause: "and the owners of that land will enslave your descendants and oppress them." (See: [[en:ta:vol2:translate:figs_activepassive]])