Angled “lie-flat” seats often found in business-class can be quite uncomfortable to sleep on. One can try to make oneself comfortable by changing into comfortable pajamas for sleeping and by making the seat more ergonomic by using extra duvets or extra pillows creatively. Another recommendation is to pick a seat with an empty seat next to it and use the empty seat for excess storage.
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How to make an angled lie-flat sleeper seat more comfortable