I tried the custom molded ones and they felt more uncomfortable to me than just buying the high-end off-the-shelf "sleep" earplugs at a major retailer. They fit nicely and do block the most noise, but tend to be very rigid/inflexible, which makes them hurt when I lay down or put pressure on them. Even just stting, they start to be uncomfortable after some time.

I can't tell what brand I'm using because I (unhelpfully for this case) throw away the box and just keep them in the plastic bag they come in, but every 6 months or so I'll go to Fred Meyer, Target, or Walmart and buy a big pack of the most expensive earplugs that say "sleep" on the box :-)