The number of pillows you need to sleep comfortably can vary greatly from person to person. There is no one-size-fits-all answer to this question. Some people prefer just one pillow, while others may use multiple pillows for different purposes, such as supporting their head, neck, back, or legs.
The key is to find a pillow arrangement that allows you to maintain good posture and feel comfortable while sleeping. Your choice of pillows and their quantity should support your individual sleep preferences and any specific needs you might have, such as alleviating neck pain or reducing snoring.
Experiment with different pillow configurations to determine what works best for you and promotes a restful night's sleep.