Three short stanzas, three quick shifts, and the poem asks the reader to fill in the gaps. It opens with an image of clear spring water compared to "five o'clock eyes," which suggests the washed, wide-open look of early morning, or perhaps eyes that have stayed up and see strangely clearly. Either way, the feeling is of freshness and clarity.
The speaker then asks for a little more time "in night's book," as if night itself were something to be read, and as if the speaker isn't ready to let it end. The title, "Bedtime reading," plays with this: the book may be a real one, or the darkness itself.
The last lines turn toward "she," someone the speaker is surprised by, and what she "will ruin herself for." It's unclear who she is, and the poem doesn't say. That mystery gives the ending a quiet, slightly unsettling edge. The mood is hushed and dreamlike, tender but uncertain, caught between waking and sleep.