Shared ground
These verses connect ordinary human experience (sleeping and waking) with the speaker’s belief that Yahweh is actively supporting him. The text’s explicit logic is simple: he slept, he woke, and he explains that ongoing life and safety as “Yahweh sustains me” (a support/holding-up idea; sustains). On that basis, he states he will not be afraid even when opposition feels overwhelming and surrounding.
The threat is portrayed as both massive (“tens of thousands”) and multi-directional (“on every side”). The speaker’s fearlessness is not presented as denial of danger; it is a stated stance in the face of real, organized opposition.
Where interpretation differs
Some readers take the sleep-and-waking language as straightforwardly literal: in a crisis, the ability to sleep and then wake safely is treated as direct evidence of protection.
Others think the language can be representative as well: “sleep” can function as a picture of vulnerability (or even near-death) and “awakening” as a picture of being preserved and restored. On this view, the point is still Yahweh’s sustaining care, but the wording may carry more than one layer.
A smaller difference shows up in how “tens of thousands” is heard: either as a more exact report of a huge force, or as a poetic way of saying “far more than I can handle.” The meaning in either case stresses overwhelming odds.
Why the disagreement exists
The pressure points are built into the poetry: sleep/waking can be everyday description, but in crisis-language it can also carry symbolic weight; large numbers can be counted or used for emphasis; “on every side” can describe physical encirclement or the felt experience of being hemmed in. The text itself does not explicitly settle how literal each element must be.
What this passage clearly contributes
Explicitly, the passage claims: (1) the speaker slept and awakened, (2) he credits that continuation to Yahweh sustaining him, (3) he therefore states he will not fear, despite opponents described as extremely numerous and surrounding. Theologically inferred from those claims is a model of confidence grounded in perceived ongoing divine support rather than improved circumstances. The courage of verse 6 is presented as flowing from the sustaining described in verse 5, not from reduced danger.