Sleeping? Or is there something wrong?

[WinterAddams]

My guinea pig Nymeria was sleeping, I think, on top of hay, she was laying on her side, eyes open but breathing in a way that made her body move back and forth (not sure how else to explain it). I could see her breathing, it seemed normal and everything.
I touched her and she did nothing, I tried petting her a bit and she continued. After a bit she woke up and was fine, I checked her breathing and all was okay. She isn't overweight or anything either.
I've noticed this motion when she's not doing anything and just sitting or laying down. My other piggy Bubbles does something similar too I believe.
So is this normal and due to their rapid breathing? Was she just sleeping? Or is there something wrong?

 

[DMS260820]

Keep an eye on it, look out for any runny nose or crusty eyes, make sure she is eating and pooing plenty. Where are you keeping your pigs, it is a fairly got day.

 

[WinterAddams]

Keep an eye on it, look out for any runny nose or crusty eyes, make sure she is eating and pooing plenty. Where are you keeping your pigs, it is a fairly got day.

I keep them in a cage, they don't get a lot of heat or cold.
They both seem fine and don't have any signs of an infection. I've noticed this today but I think they've been doing it for a while. It's not very noticeable movement and it only happens if they're not doing anything.
I'll keep an eye on them though.

 

[DMS260820]

I keep them in a cage, they don't get a lot of heat or cold.
They both seem fine and don't have any signs of an infection. I've noticed this today but I think they've been doing it for a while. It's not very noticeable movement and it only happens if they're not doing anything.
I'll keep an eye on them though.

They are most probably just deep sleeping