[ixf]

So, for sleeping I'd go for softer plugs like those made by Howard Leight for shooting (Laser Leights) or Moldex Spark Plugs.

Hearing protection always talks about attenuation in terms of dB(A) (A-weighting being a sensible thing to do when measuring perceived sound levels). 30dB(A) is a significant attenuation (logarithmic scale, don't forget). 35dB(A) is quite an improvement over 30dB(A).

For long-term use, ear plugs aren't great. But ear defenders can be had cheaply which will work well; I know of some people who use ear defenders atop in-ear active-noise-cancelling headphones as a double-whammy.

The correct answer is to work/sleep in quiet places, though, but I realise this is fast becoming a luxury.

[nkurz]

I agree with all these. If you are choosing one blindly, my preferred earplug for comfort is the Howard Leight Max Lite. Ideally, though, buy a sample pack from someone (like this, https://www.earplugstore.com/unfoamtrialp1.html) and see which one fits your ears and needs best.

Note that there is a considerable amount of technique in using earplugs correctly. You don't just shove them toward your ear and hope for the best. Normally, they are rolled tightly, and then inserted fairly deeply into the ear canal, where they then expand. Have someone demonstrate, watch a video on it, or read the instructions very closely.