Sleeper trains combine travelling with a place to sleep. Before the breakthrough of air travel, sleeper trains were the preferred way of travelling long distances overland. A few trains, including the "Orient Express" which used to run from Paris to Istanbul, became famous through film and literature. The rise of aviation (now cheaper than many long train journeys) and high speed trains (slashing travel times), and financial concerns on the part of the operators, have made many sleeper services disappear, but they are still an important part of the railway network in a number of countries.
New sleeper services have been introduced for leisure travellers. These offer a level of comfort and sightseeing not possible while flying. Tourist railways may bring them back for nostalgia. Many travellers prefer rail over flying for environmental reasons. Sleeper trains are also the cheapest or most practical way to reach certain places.
Sleeper trains often have different categories of accommodation. The exact details vary from train to train, but will typically be one or more of the following, at different prices:
On many trains – especially those that run more than one night – cabins have a "day" and "night" mode, with beds either converted to seating or folded away in the day mode: the bunks are folded up, with the lowest bunk forming a seat. You will usually get help from the train staff in converting your cabin to night mode.
Usually a carriage of couchettes or sleeper cabins will have an attendant who will check your ticket and show you to your berth. They may even provide a wake up service. If the train crosses an international border, the attendant may take your passport to show to officials, such as often in Europe, or you may be woken at the border. If you are in a seat you may be woken for ticket checks as well as border crossings. In the Schengen area border crossings may not be noticeable in any way, but there are still often controls on international trains.
A few sleeper train services also carry cars, such as the ones between the south and Lapland in Finland. This allows using your own car (or a car rented somewhere with a good supply) while avoiding sitting behind the wheel for all of a day.
The night train entered into the 21st century in a decline – high speed rail on one side and low cost air travel on the other were increasingly calling the business model into question. As a result of the rise of high-speed rail, sleeper trains have become obsolete on many routes in Japan and Western Europe, thus making them an increasingly rare breed. Europe – long a bastion of the night train – was changing over its railroads from cooperating quasi state agencies to competing private companies and running a train across several borders suddenly became more of a headache than it had ever been in peacetime. In China high-speed rail has also become more common, but the vast size of the country means that sleeper service is available on some longer high-speed routes as well, and like in Vietnam, Thailand and India, the alternatives to sleeper trains are too expensive for many people.
When Deutsche Bahn, once the biggest operator of night trains on the continent, wound down that part of their business, many foresaw only doom and gloom, but all was not lost: the Austrian railway (ÖBB) bought up the younger parts of the rolling stock DB had used (serendipitously DB had younger cars in exactly those categories in which ÖBB had most need for replacements) and offered service both on routes into or through Austria and routes without any connection to the small alpine republic. The unexpected success of the Austrian sleeper trains and increasing calls for "greener" transportation options – including the well publicized trips of Greta Thunberg by train across half of Europe – led to increasing calls for more night train service. The European Union declared their intention to help union-wide sleeper trains, several national governments announced their willingness to pick up any potential operating losses of proposed new routes and private operators saw their niche here and there offering their own services. Even the Covid-19 crisis did not throw a wrench into the growth plans as families could book an entire compartment and thus reduce infection risk on their trips to and from a much earned vacation in the "covid summer".
Sleeper trains normally appear on long journeys which cannot realistically be completed in a single day.
Europe invented the concept, and legendary routes used to criss-cross the continent. Many have been shut down, and many others are under threat. There is still quite good coverage though, especially in the east and in the Nordic countries.
Unlike daytime trains, sleepers usually must be booked in advance. For high-demand days, the sleepers may sell out quickly.
While most railways allow you to book sleeper trains the same way you book any regular train (e.g. at ticket counters, online or via phone), you often have to get a seat – or in this case berth – reservation, which often includes the surcharge for sleeper service. Often passes, like Interrail, only cover the price for a "standard seat" in second class and the sleeper surcharge has to be paid on top of that.
Accommodation is usually sold on a first-come, first-served basis and you may get bargains by booking early or by getting an "upgrade" when already on the train if berths are available.
Sleeper trains often run through several countries. While the operator needs agreements with the national railways, these do not necessarily handle bookings. Check what entity to contact for tickets. In some cases tickets are sold through different services to different prices.
Most sleeper trains also have a dining car, while almost all of the others offer food at your cabin. However the dining car can have limited supplies which may run out if the train is running late, so you may wish to bring some food with you as a backup. Many train companies post their menus (including prices) on-line and you can usually rely on these being at least somewhat accurate. However serving sizes are often smaller and prices often higher than comparable food outside a train. Depending on the route and railway, breakfast or even all meals may be included in premium fares or all sleeper fares.
The tap water on a train is usually not drinkable – in Europe this is usually clearly indicated either by a pictogram or in words (usually in more than one language), in other places it might be apparent from context. You may want to bring some bottled water with you, as it will be cheaper to buy this in the station (or a regular supermarket) than on the train. In the rare cases of catastrophic air conditioning failure, you might get free drinks to ease the heat. But as sleeper trains travel mostly at night, this is rather unlikely.
In some countries you are not allowed to bring your own alcohol, as the train is a "licensed premises" like a pub. On some trains all alcohol is prohibited, but in most countries this rule only affects commuter trains and has not yet spread to sleepers. However, people in the neighbouring cabins may want to get a good night's sleep, and some may have an early morning; don't have loud parties.
While some people love the rumbling and bumbling of the train that "rocks them to sleep" others hate the noise and cannot sleep. While some countries invest a lot in their rail networks to reduce bumps, in other countries you are definitely in for a bumpy ride. Your mileage as to sleeping may certainly vary. In bunk accommodation that is shared with several other people snoring may also be a problem, so bring earplugs. Sleeping in a regular seat, even if it is reclining, is certainly not all that comfortable, but a lot of budget conscious travellers have done so in the past and regular seats are still available on most trains with sleepers, sometimes for quite affordable rates indeed, compared to more comfortable options.
While en suite bathrooms are uncommon, many sleeper trains have shared showers, at least in Europe. As there will certainly be queues in the morning, you might want to plan when to go. The showers are usually cramped, at least the en suite ones.