27 Heb “and to me how precious are your thoughts, O God.” The Hebrew verb יָקַר (yaqar) probably has the sense of “difficult [to comprehend]” here (see יקר qal.1 and note the use of Aramaic יַקִּר in Dan 2:11). Elsewhere in the immediate context the psalmist expresses his amazement at the extent of God’s knowledge about him (see vv. 1–6, 17b–18).
28 Heb “how vast are their heads.” Here the Hebrew word “head” is used of the “sum total” of God’s knowledge of the psalmist.
29 Heb “I awake and I [am] still with you.” A reference to the psalmist awaking from sleep makes little, if any, sense contextually. For this reason some propose an emendation to הֲקִצּוֹתִי (haqitsoti), a Hiphil perfect form from an otherwise unattested verb קָצַץ (qatsats) understood as a denominative of קֵץ (qets, “end”). See L. C. Allen, Psalms 101–150 (), .

In other versions

How precious to me are your thoughts, O God!

How vast is the sum of them!

If I would count them, they are more than the sand.

I awake, and I am still with you.

How precious to me are your thoughts, God!

How vast is the sum of them!

Were I to count them,

they would outnumber the grains of sand—

when I awake, I am still with you.

God, how precious your thoughts are to me;

how vast their sum is!

If I counted them,

they would outnumber the grains of sand;

when I wake up, I am still with you.

How precious are your thoughts about me, O God.

They cannot be numbered!

I can’t even count them;

they outnumber the grains of sand!

And when I wake up,

you are still with me!

And to me, how precious are your thoughts, O God;

how vast is their sum.

If I should count them,

they would outnumber the sand.

I awaken, and I am still with you.

How precious also are thy thoughts unto me, O God!

How great is the sum of them!

If I should count them, they are more in number than the sand:

When I awake, I am still with thee.

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