Let me embrace the general details before stepping onto the concrete mentions.
·Remarcable structure built around an alternation between the start of 'Today' and 'Tonight', and the start of the fifth verse as 'but' or 'when'.
·Alteration between a pair of rhymed verses (pareado, i would say) and a common structure of a-b-b-a, particular of quatrains.
·Addition of a fifth line, which is rather a maxima to me than part of the stanzas themselves, introducing a quote, decision, acceptation to the previous verses, and to the context itself. (yet, i firstly felt as if it was an unfinished 6-verse stanza.
·Syllabic count tilts slightly. (I won't say more, as i am a bit obsessed with it)

From what i see, It's a context with an integrated chaos, and a slightly dark atmosphere, with the Narrator, tryin to overcome it.
A bit confused, for, if the Narrator falls or rises (If said, excuse me).

To remark, i say:
The 5th verses of the 2 last stanzas are especially calling to the eye.