I bought a piece of 1.5 inch stiff foam to try to fix a sag in a bed. It didn’t work but having that thick piece of solid foam around has been a life saver.
Need something flat to put a laptop on? Throw it on the foam. Going to be doing something that requires you to be on your knees for a while? Get the foam!
It went from stupid purchase to something I’d gladly replace if it broke.
I’ve used night masks before and they work well, but I always would wake up tired because it was too dark to see it getting light out. I ended up going with blackout curtains and an alarm clock that slowly turns the light on over a 30 minute period to mimick the same effect.
Obviously way more of an investment in money, but I find my sleep quality has vastly improved with doing so.
An extra bonus is that blackout curtains can help keep heat out if you live somewhere warm.