With eurolines (http://eurolines.com), you can travel overnight between many countries. There are no beds, but rows of seats like in a plane, there is slightly more space and they recline more, so you can very well sleep. Seats are not as comfortable as in colombian buses, though (I’ve tried both).
You could also try night trains, but they tend to be more expensive and no more comfortable.
Edit: Take also a look to idBus, which offers a similar service. The company claims it offers a high standard of comfort, but I have not travelled with them and cannot confirm.
In the UK, there was MegabusGold who ran a sleeper service.
MegaBus Gold ended on 21 May 2017, so that service no longer exists. I think it was the last true bus sleeper in Western Europe.
Bus sleepers are banned in Germany for safety reasons (reference: StVZO §35i (2)).
Credit:stackoverflow.com‘
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