TBH I find the Lion's Bride worse, cause I don't know what to write about it. At first I found Night and Dreams a pain in the butt but it's grown on me. Night and Dreams isn't so bad. You just need to find things in it that you can link back to the other poems.
To me, it seems to be laced with regret -- Crab is a recurring dream -- cause she ate him sixty years ago and he still comes back. (or maybe nostalgia? when writing about part two and the 'lovely room... restoring, recomposing' etc...)
Harwood also makes a mention to the plight of animals, when she writes about how Crab died -- the hatpin, raging to red, etc, which is a theme that's carried in the Spelling Prize and The Secret Life of Frogs and so on, trying to get sympathy towards Crab, in a way, I spose...
I guess you could mention how structurally it's a contrast to her other poems, or something about the fact that it is so haywire as to mimick the structure (or lack thereof) in a dream...
maybe talk about domesticity in part 4, when she's talking about the sheep and the herbs to plant. i don't know what to make about the whole 'put my arm around your waist/put my armour round your waist' part, though...
oh, and his seaweed cloak and clothes in general: they're all intact and a source of pride (kind of) at the start but then in part two it's all shredded, which shows how his dignity has been taken away.
i had more but i can't really remember it off the top of my head... maybe tomorrow i might add to this, when i have the notes (and the actual poem!!) in front of me.
hope it's of some help.