Why weight and darkness work.
Darkness is a signal, not a preference.
Your body's sleep rhythm is driven partly by light exposure. Blocking it isn't comfort — it's information.
Deep pressure feels safe.
Even, gentle pressure across a broad area is why a heavy blanket feels calming to a lot of people. The key word is even — a small hard point just feels like a poke.
The mask has to stay on.
A mask that slips or presses on your eyes gets ripped off at 2am. Fit and profile matter as much as opacity.
This is general information, not medical advice. Talk to a healthcare professional about ongoing sleep problems.