Pillows fail gradually, which is why people keep them years too long. The fill compresses a little each night, the loft drops below what your neck needs, and the shoulders and neck quietly take over the support job. The result is morning stiffness that most people blame on the mattress.
TEST 1: THE FOLD TEST. For down, feather and polyester pillows, fold the pillow in half and let go. A healthy pillow springs back open. If it stays folded, the fill has lost its resilience and the pillow is done. This test does not apply to memory foam or latex, which are supposed to return slowly or stay put.
TEST 2: THE FLAT-HAND TEST. Lay the pillow flat and press down with your palm. If your hand sinks most of the way to the mattress with light pressure, there is not enough material left to support your head.
TEST 3: THE MORNING SYMPTOM TEST. If you wake with neck stiffness, a dull headache above the neck, or a numb arm several mornings a week, and those symptoms ease within an hour of getting up, the pillow is the first thing to change.
TEST 4: THE HOTEL TEST. If you consistently sleep better on other people's pillows, yours has lost loft. This is the most reliable real-world signal and the one people most often ignore.
TEST 5: THE STAIN AND ODOR TEST. Permanent yellowing through the fill, or a smell that survives a proper wash, means the fill has absorbed years of sweat and oils. At that point it is also a dust mite reservoir.
TEST 6: THE LUMP TEST. Run your hands across the pillow. Clusters and hollows mean the fill has migrated and will not redistribute evenly, so support changes depending on how you land on it.
REALISTIC LIFESPANS BY FILL. Polyester and down-alternative: about 1 to 2 years, the shortest of any fill because the fibers mat permanently. Down and feather: 2 to 4 years with regular fluffing and washing. Shredded memory foam: 2 to 3 years, and you can extend it by topping up the fill if the brand sells refills. Solid memory foam: 2 to 4 years. Latex: 4 or more years, the most durable common fill. Buckwheat: 5 or more years for the casing, and the hulls themselves can be replaced separately.
HOW TO MAKE PILLOWS LAST LONGER. Use a zipped protector and wash it monthly — moisture is what kills fill. Fluff down and polyester pillows daily so the fibers do not set. Wash washable pillows every three to six months and dry them completely. Keep foam and latex out of direct sunlight. Rotate between two pillows if you can, giving each a full day to recover its loft.
WHAT TO BUY NEXT. Before replacing like-for-like, check whether your loft was actually right in the first place. Most people replace an unsuitable pillow with the same unsuitable pillow. Our pillow selection guide covers how to work out your loft target from sleep position, shoulder width and mattress firmness.