well sure you can spend a lot on curtains if you’d like but you can also get cheap(ish) ones that do the job lol i have blackout Ikea curtains in all my bedrooms. they look great and only cost about €60 a pair.
ah right that makes sense
I always travel with eye patches for this reason!! I sleep better when its dark. I’ve been on pet sits in the USA with no curtains or shades/blinds on a massively busy street too!
We usually pinch cardboard from the supermarket and create makeshift blackout blinds.
A childhood brought up on Blue Peter has made me a dab hand with some scrap card, an empty toilet roll holder, an egg box, a washing up bottle, four wire coat hangers, and some sticky-backed plastic.
@Colin Are you brewing your own hooch as well? 
Use the yoghurt cartons as tumblers.