Three short lines, three small images, and almost no explanation. That sparseness is part of the point. We get teabags, a tingling feeling, and eyelids that feel heavy, and we're left to connect them ourselves.
The most natural reading is a quiet moment of tiredness. Teabags suggest a warm drink, the kind you make when you're worn out or trying to settle down. The tingling could be the warmth spreading through the body, or the strange fuzzy sensation of being very sleepy. The last image, heavy eyelids, tips everything toward sleep. The poem seems to end right where the speaker is about to drift off.
The mood is calm, drowsy and a little hushed. Nothing is happening, and that's what makes it restful. The poem's brevity also mimics the feeling it describes: thoughts shrinking down to a few simple words as the mind slows. The title, «Uutku 1», gives no further clue, so the sensations themselves carry the poem.