For me it's the alarm clocks or in-room tablets. So much annoying ambient lights in hotels. It's gotten crazy.

I just travel with a mulberry silk eye mask. Seems to do the trick.

Since you went into such specifics (could have just sad eye mask/sleeping mask), why the specific mention of mulberry silk?

I would imagine because if they just said "eye mask", someone might imagine negative aspects that don't apply to a more luxurious/premium material like mulberry silk.

I personally find it easier to sleep when my pillow is cool. Silk feels cool to touch. I'd image that it would help. Not sure if it being mulberry makes any difference.

I find non-mulberry-silk ones quite bothersome texture wise, as opposed to pleasant.