I have to be out of my apartment for a week so I can't be there and make physical measurements with a tape measure or anything, but I have a picture on my phone.

I want to get blackout or at least light-darkening curtains but I want to get a fitting length. I've never had ceilings this tall before (they're crazy high).

(Here's a pic if anyone has a suggestion. The bed is a basic twin for reference. I don't want the curtains to go down in front of the heater for obvious reasons but I do want to be able to block out as much light as possible.)