Kaleidoscope Dreams

[UnicornRainbowCake]

I lollop on my bed,
An arena of dreams. 'Lollop' and "arena' don't fit in with each other well. Lollop is childlike/clumsy, but arena has connotations of crowded, gladiator fighting kind of violence.
I rest my head,
Eyes burst at the seams. This just seems cliche

A mirage of bright colours, Is mirage the right word to use?
Arranged in a pattern,
The beauty, it smothers,
I’ve landed on Saturn. Well that was one hell of a twist

The brightness goes dim, Wait. What about Saturn? Does Saturn go dim? Why are we on Saturn? How did you get to Saturn? Unanswered questions
I start to begin, Change of rhyming scheme at the end? I'll presume it was deliberate
To realise I’m home So you live on Saturn or you've gone home to Earth?
Engulfed in foam. Is this an allusion to something? It doesn't link to anything else in your poem

This isn't all negative - you've used punctuation and grammar correctly, and most of your rhymes are rhymes. I would repost in novice as it needs quite a bit of work before being in serious. You have used techniques correctly, but not to an enhanced effect. Your line breaks are there because it makes the rhyming work, but it doesn't enhance your poem. As ever, this is just what I think and I have understood your poem as.

[tectak]

I lollop on my bed, lollop us a good word but is diminished here because it has comedic connotations. I feel it is ill-placed in this piece. We shall see
An arena of dreams. There is no need to capitalise each line. It is out of date and schoolboy poetry. It never could be justified...even by Coleridge et al....and I would argue with him.
I rest my head, Hopelessly familiar cliche. Say something new...in your own words
Eyes burst at the seams. nice try but not conceptually reasonable. Do you imagine eye seams? Nor eye. Sorry, I.

A mirage of bright colours,
Arranged in a pattern, I think we are talking kaleidoscopically here. Cliched by avoidance of cliche....if that makes sense.
The beauty, it smothers,
I’ve landed on Saturn. Oops....wha? who? whi? That is quite some dope you got there. This is weak and adolescent stuff. It's your own fault. Not much rhymes with "pattern"...so change it to,say, " In God sent profusion". Then you could end the stanza with confusion, illusion, diffusion, protrusion, intrusion, delusion or thousands of "...sion" words. Saturn? You're having a larf!

The brightness goes dim, Oh. Dim brightness? Not come across that since the light darked!
I start to begin, Tautologically speaking, of course. Of course you started to begin. Poor language use. Thank goodness you do not charge for this stuff
To realise I’m home
Engulfed in foam. Very forced rhyme. "I realise I'm back, covered in cack". "I realise I'm here, get me a beer." " I realise I'm home, eating a bone" Take your pick. It matters not.

Hello the modestly named bard UK
Welcome to serious crit. A line by line I think...it is a short piece. This is what is technically called not very good. The thing is puerile and childish. Sorry, but that is what comes across. You need to understand that simplistic rhymes, whilst acceptable if not obvious, are not the whole thing.
This piece is not weighty enough to warrant criticism of a damning nature and I regret that you felt it was. As another has suggested, you may be better off in the "mild" forum until you get the feel of the place. Poetically, this is probably not your best, even by your own standards, as it is so gratuitously pseudo-serious it is funny. Do not think that posting in mild is denegrating...but the crits there will help you to develop your own style and niche.
Best,
keep writing,
tectak