Ferry from Cherbourg to Ireland

I don't recommend a reclining seat; it won't be any better than "sleeping" on an airplane. I have slept well on overnight ferries when I had a cabin (or shared one). www.irishferries.com and www.stenalinetravel.com both offer cabins on this route; Stena Line does not run daily.

I tried sleeping on a reclining chair on a cross channel ferry once and it didn't happen despite a fair few beers beforehand. If you want to sleep I advise getting a cabin.

Toilet facilities tend to be adequate enough. Clean, basic but fit for purpose. Dining wise, don't get your hopes up.