I bought a new mattress. the top part is memory foam. It arrived shrink-wrapped, basically they vaccuum out the air and pack it in plastic in a box - it's about 2-3" thick.
I slept 4 hours last night [wait, it gets better] but had a hospital app't.
I'd gone with patient transport and every bone ached by the time they dropped me home.
While I was at the hospital, my carer called [she'd forgotten I was out] seeing the mattress, she put it on my bed.
I was delighted to read she'd done it and put a fitted sheet on it too.
She'd taken out the thin mattress added the sheet and gone.
imagine my face hen, desperate for sleep, I walked into my bedroom.
the mattress had now expanded to full mattress size - on top of the old one!!!!
[she'd thought it was a 2" topper]
I was crying with laughter at my 12" deep waist high bed!
I couldn't get on it,
luckily she called back and took the old one off. - she didn't find it funny at first, but then started to chuckle.