Eye Mask - I sleep so much better and longer with one on. I recommend one that doesn't sit on your eyes directly (has a bit of concavity).
tried several models and the Ohropax Schlafmaske 3D is the best. has concave eye patches - so, maybe you already use it. also washable and quite sturdy.
https://www.shop-apotheke.com/arzneimittel/9667846/ohropax-s...
The only nitpick is that if you're a side sleeper (I am) it can be a little uncomfortable depending on what kind of pillow you use. I use shredded memory foam pillows and they're pretty firm.