The speaker is worn out by the "clock within me," an inner sense of time that ticks on whether they want it to or not. The short, blunt lines "enough / go away" sound like someone who has run out of patience and simply wants quiet. It reads almost like a plea to their own body or mind.
The second stanza shifts to a quiet complaint. The speaker was "promised school," which suggests an expectation of learning, growth, or purpose. What they got instead was a lesson in sleep. That could mean literal exhaustion, or it could hint at numbness, a life where being awake never quite happened. The poem doesn't spell it out, so the reader has to decide.
The mood is tired, dry, and a little wry. There is frustration, but it is muted rather than angry, as if even complaining takes effort. The sparseness of the words mirrors that fatigue: the poem says just enough and then stops.